In this paper we investigate the geometric structure of the variety Bx of all Borel subgroups in a given linear algebraic group, which contain a fixed unipotent x. Bx is explicitly described in terms of Schubert cells for a certain class of unipotents. © 1986.
Lorist, P. (1986). The geometry of Bx. Indagationes Mathematicae (Proceedings), 89(4), 423–442. https://doi.org/10.1016/1385-7258(86)90027-2