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Illusie, Luc (1972). "Cotangent complex and deformations of torsors and group schemes". In Lawvere, F. William (ed.). Toposes, Algebraic Geometry and Logic: Dalhousie University, Halifax, January 16-19, 1971. Toposes, Algebraic Geometry and Logic. Lecture Notes in Mathematics. Vol. 274. Berlin, Heidelberg, New York: Springer. pp. 159–189. doi:10.1007/BFb0073969. ISBN978-3-540-37609-5.