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1. 12.06.2008, Leibniz Universität Hannover:
   K3-Flächen vom Picard Rang 20
   [Research Seminar Algebraic and Arithmetic Geometry]
2. 02.06.2008, Uniwersytetu Jagiellońskiego, Krakow:
   K3 surfaces and modular forms
   [Seminar on algebraic and analytic geometry]
3. 18.03.2008, Queen's University, Kingston, ON:
   K3 surfaces of Picard rank 20
   [Queen's Number Theory Seminar]
4. 17.03.2008, Queen's University, Kingston, ON:
   Lines on Fermat surfaces
   [Queen's Algebraic Geometry Seminar]
5. 15.03.2008, Fields Institute, Toronto, ON:
   K3 surfaces and modular forms
   [Workshop on algebraic varieties]
6. 17.01.2008, Universität Duisburg-Essen:
   K3 surfaces and modular forms
   [Oberseminar Algebraische Geometrie Duisburg-Essen-Düsseldorf]
7. 12.01.2008, Courant Research Center Göttingen:
   K3 surfaces and modular forms
   [Courant-Colloquium]
8. 10.01.2008, Leibniz Universität Hannover:
   K3-Flächen und Modulformen
   [Research Seminar Algebraic and Arithmetic Geometry]
9. 18.12.2007, University of Copenhagen:
   K3 surfaces and modular forms
   [Copenhagen Mathematics Colloquium]
10. 03.12.2007, MIT, Cambridge, MA:
    K3 surfaces of Picard rank 20 over Q
    [MIT STAGE]
11. 13.11.2007, MIT, Cambridge, MA:
    Calabi-Yau threefolds as fibre products of rational elliptic surfaces
    [Harvard/MIT algebraic geometry seminar]
12. 30.10.2007, Brandeis University, Waltham, MA:
    Singular K3 surfaces
    [Everytopic Seminar]
13. 13.09.2007, University of Texas, Austin, TX:
    Singular K3 surfaces
    [University of Texas - algebra, number theory and combinatorics seminar]
14. 06.09.2007, Rikkyo University, Tokyo:
    Singular K3 surfaces
    
15. 29.08.2007, Nagoya University:
    Singular K3 surfaces and modular forms
    [Conference on Birational Automorphisms of Compact Complex Manifold and Dynamical Systems]
16. 16.08.2007, Queen's University, Kingston, ON:
    Singular K3 surfaces and modular forms
17. 27.03.2007, Amherst College:
    Singular K3 surfaces
    [Amherst Five College Number Theory Seminar]
18. 26.02.2007, Boston University:
    Singular K3 surfaces
    [Boston University Algebra Seminar]
19. 08.02.2007, Georg-August-Universität Göttingen:
    Singuläre K3 Flächen
    [Events calendar of the mathematical faculty Göttingen (German)]
20. 21.12.2006, Rheinische Friedrich-Wilhelms-Universität Bonn:
    Singular K3 surfaces
    [Bonn mathematics events calendar]
21. 09.12.2006, CMS Winter 2006 Meeting:
    Classifying singular K3 surfaces
    [Session on Calabi-Yau Varieties and Mirror Symmetry]
22. 14.11.2006, Rice University, Houston:
    Classifying singular K3 surfaces
    [Rice Algebraic Geometry Seminar]
23. 24.10.2006, Harvard University:
    Classifying singular K3 surfaces
    [Harvard/MIT Algebraic Geometry Seminar]
24. 21.10.2006, Fields Institute, Toronto:
    CM-modular forms and Calabi-Yau varieties
    [Workshop on Algebraic Varieties]
25. 04.10.2006, Harvard University:
    CM newforms with rational coefficients
    [Harvard/ Number Theory Seminar]
26. 08.07.2006, Lauenbrück Seminar:
    Elliptic modular surface for the commutator subgroup of SL(2,Z)
27. 16.03.2006, Universita' degli Studi di Milano:
    Modularity of Calabi-Yau varieties
    [Number Theory Seminar Milano]
28. 02.02.2006, Universita' degli Studi di Milano:
    Calabi-Yau threefolds as fibre products of elliptic surfaces
    [Algebraic Geometry Seminar Milano]
29. 20.12.2005, University Duisburg-Essen, Germany:
    Arithmetic of singular K3 surfaces and Hecke eigenforms
    [DFG-Research group "Arithmetic and Geometry"]
30. 09.08.2005, AMS Summer Institute on Algebraic Geometry, University of Washington, Seattle, USA:
    Arithmetic of K3 surfaces
    [2005 AMS Summer Institute on Algebraic Geometry]
31. 28.04.2005, University of Hannover, Germany:
    Hecke eigenforms with complex multiplication and rational coefficients
    [Oberseminar AKG Hannover]
32. 18.03.2005, University of Groningen, Netherlands:
    Extremal elliptic K3 fibrations
    [Intercity number theory seminar]
33. 25.11.2004, University of Hannover, Germany:
    Singular K3 Surfaces
    [Oberseminar AKG Hannover]
34. 16.11.2004, University of Mainz, Germany:
    On the modularity of certain fibre products of the rational elliptic modular surface of level 5
    [Gästeseite AG Mainz]
35. 05.04.2004, University of Hannover, Germany:
    Modular Calabi-Yau threefolds arising from the modular elliptic surface of level 5
    [AKG Miniworkshop]
36. 23.03.2004, Duke University, Durham, NC, USA:
    New examples of modular rigid Calabi-Yau threefolds
    [Duke AG, Spring 2004]