@book{AST_1985__123__1_0, author = {Kupershmidt, B. A.}, title = {Discrete {Lax} equations and differential-difference calculus}, series = {Ast\'erisque}, publisher = {Soci\'et\'e math\'ematique de France}, number = {123}, year = {1985}, zbl = {0565.58024}, mrnumber = {785802}, language = {en}, url = {http://archive.numdam.org/item/AST_1985__123__1_0/} }