@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},
     mrnumber = {785802},
     zbl = {0565.58024},
     language = {en},
     url = {http://www.numdam.org/item/AST_1985__123__1_0/}
}