Defines outer Severi-Brauer schemes via sheaves of flags and idempotents for outer type A_n groups and shows an outer Quillen's construction exists.
Breen, On the Classification of 2-gerbes and 2-stacks, Paris: Société mathématique de France (1994)
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Outer Type Severi-Brauer Schemes
Defines outer Severi-Brauer schemes via sheaves of flags and idempotents for outer type A_n groups and shows an outer Quillen's construction exists.