Sampei Usui

Algebraic Geometry 2000, Azumino – Program and Acknowledgement

Mark Green, Sampei Usui, Luc Illusie, 2002 .

Toroidal compactifications and Borel--Serre compactifications

Sampei Usui, Kazuya Kato, Chikara Nakayama, 2021, 2107.10999.

Classifying spaces of degenerating mixed Hodge structures, V: Extended period domains and algebraic groups

Sampei Usui, Kazuya Kato, Chikara Nakayama, 2021, 2107.03561.