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2024
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| 1. | Huybrechts, Daniel; Ottem, John Christian. Nodal quintic surfaces and lines on cubic fourfolds. L'Enseignement mathématique (LEM) 2024 UiO |
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2023
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| 2. | Degtyarev, Alex; Itenberg, Ilia; Ottem, John Christian. Planes in cubic fourfolds. Algebraic Geometry 2023 ;Volume 10.(2) p. 228-258 UiO |
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| 3. | Ottem, John Christian; Suzuki, Fumiaki. An O -acyclic variety of even index: With an appendix by Olivier Wittenberg. Mathematische Annalen 2023 UiO |
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2022
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| 4. | Nicaise, Johannes; Ottem, John Christian. Tropical degenerations and stable rationality. Duke mathematical journal 2022 ;Volume 171.(15) p. 3023-3075 UiO |
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2021
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| 5. | Benoist, Olivier; Ottem, John Christian. Two coniveau filtrations. Duke mathematical journal 2021 ;Volume 170.(12) p. 2719-2753 UiO |
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| 6. | Nicaise, Johannes; Ottem, John Christian. A refinement of the motivic volume, and specialization of birational types. Progress in Mathematics 2021 ;Volume 342. p. 299-322 UiO |
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| 7. | Ottem, John Christian. Enriques surface fibrations with even index. Frankfurt Algebraic Geometry seminar; 2021-02-17 - 2021-02-18 UiO |
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| 8. | Ottem, John Christian. Tropical degenerations and stable rationality. Projective and birational higher dimensional geometry; 2021-04-09 - 2021-04-09 UiO |
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| 9. | Ottem, John Christian. Tropical degenerations and stable rationality. Tropical Geometry in Zoom TGiZ (`TGiF'); 2021-02-03 - 2021-02-03 UiO |
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| 10. | Ottem, John Christian. Tropical degenerations and stable rationality. "Riposte Armonie": Algebraic Geometry in Cetraro 2021 together with Ciro Ciliberto; 2021-09-20 - 2021-09-24 UiO |
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| 11. | Ottem, John Christian; Ottem, John Christian. Enriques surface fibrations with even index. Séminaire de topologie, géométrie et algèbre; 2021-03-04 - 2021-03-05 UiO |
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2020
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| 12. | Benoist, Olivier; Ottem, John Christian. Failure of the integral Hodge conjecture for threefolds of Kodaira dimension zero. Commentarii Mathematici Helvetici 2020 ;Volume 95. p. 27-35 UiO |
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| 13. | Gounelas, Frank; Ottem, John Christian. Remarks on the positivity of the cotangent bundle of a K3 surface. Épijournal de Géométrie Algébrique (EPIGA) 2020 ;Volume 4.(8) UiO |
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| 14. | Ottem, John Christian. Enriques surface fibrations with non-algebraic integral Hodge classes. K-theory, algebraic cycles and motivic homotopy theory; 2020-02-03 - 2020-02-03 UiO |
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| 15. | Ottem, John Christian. Nef cycles on some hyperkähler fourfolds. arXiv.org 2020 UiO |
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| 16. | Ottem, John Christian. On (2,3)-fourfolds. Stanford Algebraic geometry seminar; 2020-07-10 - 2020-07-10 UiO |
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| 17. | Ottem, John Christian. Tropical degenerations and stable rationality. Zoom Algebraic Geometry; 2020-05-14 - 2020-05-14 UiO |
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| 18. | Ottem, John Christian. Tropical degenerations and stable rationality. Iskovskikh Algebraic geometry seminar; 2020-04-30 UiO |
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| 19. | Ottem, John Christian; Suzuki, Fumiaki. A pencil of Enriques surfaces with non-algebraic integral Hodge classes. Mathematische Annalen 2020 ;Volume 377. p. 183-197 UiO |
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2019
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| 20. | Mongardi, Giovanni; Ottem, John Christian. Curve classes on irreducible holomorphic symplectic varieties. Communications in Contemporary Mathematics 2019 ;Volume 22.(7) UiO |
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| 21. | Mongardi, Giovanni; Ottem, John Christian. Curve classes on irreducible holomorphic symplectic varieties. arXiv.org 2019 UiO |
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| 22. | Ottem, John Christian. A counterexample to the birational Torelli problem. College de France; 2019-06-09 - 2019-06-09 UiO |
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| 23. | Ottem, John Christian. A pencil of Enriques surfaces with non-algebraic integral Hodge classes. Workshop on algebraic geometry; 2019-07-26 - 2019-07-26 UiO |
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| 24. | Ottem, John Christian. A pencil of Enriques surfaces with non-algebraic integral Hodge classes. Geometry of algebraic varieties; 2019-09-28 - 2019-10-04 UiO |
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| 25. | Ottem, John Christian. Counterexamples to the integral Hodge conjecture. Workshop on birational geometry; 2019-03-26 - 2019-03-26 UiO |
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| 26. | Ottem, John Christian. Counterexamples to the integral Hodge conjecture. MSRI algebraic geometry seminar; 2019-02-18 - 2019-02-18 UiO |
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| 27. | Ottem, John Christian. Deformations of hypersurfaces. Positivity and vanishing theorems; 2019-06-05 - 2019-06-05 UiO |
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| 28. | Ottem, John Christian; Schreieder, Stefan. On deformations of quintic and septic hypersurfaces. Journal des Mathématiques Pures et Appliquées 2019 ;Volume 135. UiO |
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2018
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| 29. | Lehmann, Brian; Ottem, John Christian. Positivity of the diagonal. Advances in Mathematics 2018 ;Volume 335. p. 664-695 UiO |
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| 30. | Ottem, John Christian. Failure of the Integral Hodge conjecture for 3-folds. ICMS algebraic geometry conference; 2018-12-05 - 2018-12-05 UiO |
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| 31. | Ottem, John Christian. Integral hodge conjecture for holomorphic symplectic varieties. Workshop of cubic hypersurfaces; 2018-08-22 - 2018-08-22 UiO |
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| 32. | Ottem, John Christian. Integral Hodge conjecture for threefolds. Munich algebraic geometry seminar; 2018-07-07 - 2018-07-07 UiO |
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| 33. | Ottem, John Christian. Integral Hodge conjecture for threefolds. Tropical geometry and amoebas; 2018-04-14 - 2018-04-14 UiO |
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| 34. | Ottem, John Christian. Positivity of the higher codimension cycles. Positivity in algebraic geometry; 2018-06-10 - 2018-06-10 UiO |
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| 35. | Ottem, John Christian. The birational Torelli problem for Calabi-Yau 3-folds. Seminar Algebraic Geometry (SAG); 2018-01-18 - 2018-01-18 UiO |
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| 36. | Ottem, John Christian. The integral Hodge conjecture for threefolds. Workshop on algebraic geometry; 2018-05-13 - 2018-05-13 UiO |
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| 37. | Ottem, John Christian; Gounelas, Frank. Remarks on the positivity of the cotangent bundle of a K3 surface. arXiv.org 2018 UiO |
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| 38. | Ottem, John Christian; Rennemo, Jørgen Vold. A counterexample to the birational Torelli problem for Calabi-Yau 3-folds. Journal of the London Mathematical Society 2018 ;Volume 97.(3) p. 427-440 UiO |
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| 39. | Ottem, John Christian; Schreieder, Stefan. On deformations of quintic and septic hypersurfaces. arXiv.org 2018 UiO |
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2017
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| 40. | Ottem, John Christian. A counterexample to the birational Torelli problem for Calabi Yau threefolds. Workshop on Periods and Ricci flat manifolds; 2017-09-22 - 2017-09-22 UiO |
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| 41. | Ottem, John Christian. A counterexample to the birational Torelli problem for Calabi-Yau threefolds. Geometry, Physics, and Representation Theory Seminar.; 2017-11-09 - 2017-11-09 UiO |
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| 42. | Ottem, John Christian. Nef cycles of higher codimension. Columbia algebraic geometry seminar; 2017-11-03 - 2017-11-03 UiO |
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| 43. | Ottem, John Christian. Nef cycles on some hyperkahler fourfolds. UGA algebra seminar; 2017-02-20 - 2017-02-20 UiO |
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| 44. | Ottem, John Christian. Nef cycles on some hyperkahler fourfolds. ETH algebraic geometry seminar; 2017-12-13 - 2017-12-15 UiO |
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| 45. | Ottem, John Christian. Nef cycles on some hyperkahler manifolds. UCLA algebra seminar; 2017-02-17 - 2017-02-17 UiO |
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| 46. | Ottem, John Christian. Nef cycles on some hyperkahler manifolds. Newton-Okounkov Bodies, Test Configurations, and Diophantine Geometry (17w5046); 2017-02-05 - 2017-02-10 UiO |
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| 47. | Ottem, John Christian. Positivity of the diagonal. Humboldt Algebraic Geometry Seminar; 2017-07-05 - 2017-07-05 UiO |
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| 48. | Ottem, John Christian. Positivity of the diagonal. Positivity in algebraic and complex geometry; 2017-04-24 - 2017-04-28 UiO |
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| 49. | Ottem, John Christian. Positivity of the diagonal. Mini-Workshop: Positivity in Higher-dimensional Geometry: Higher-codimensional Cycles and Newton-Okounkov Bodies; 2017-09-17 - 2017-09-23 UiO |
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| 50. | Ottem, John Christian. Semiample line bundles in positive characteristic. UiO Algebraseminar; 2017-03-16 - 2017-03-16 UiO |
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