Borovik, A. V. (2003), "Matroids and Coxeter groups", Surveys in combinatorics, 2003 (Bangor), London Math. Soc. Lecture Note Ser., vol. 307, Cambridge Univ. Press, Cambridge, pp. 79–114, doi:10.1007/978-1-4612-2066-4, ISBN978-1-4612-7400-1, MR2011735. See in particular Section 3.1, "The Gelfand–Serganova Theorem", p. 97.
Borovik, A. V. (2003), "Matroids and Coxeter groups", Surveys in combinatorics, 2003 (Bangor), London Math. Soc. Lecture Note Ser., vol. 307, Cambridge Univ. Press, Cambridge, pp. 79–114, doi:10.1007/978-1-4612-2066-4, ISBN978-1-4612-7400-1, MR2011735. See in particular Section 3.1, "The Gelfand–Serganova Theorem", p. 97.
Borovik, A. V. (2003), "Matroids and Coxeter groups", Surveys in combinatorics, 2003 (Bangor), London Math. Soc. Lecture Note Ser., vol. 307, Cambridge Univ. Press, Cambridge, pp. 79–114, doi:10.1007/978-1-4612-2066-4, ISBN978-1-4612-7400-1, MR2011735. See in particular Section 3.1, "The Gelfand–Serganova Theorem", p. 97.