@incollection{AST_1977__41-42__55_0,
     author = {Katz, Nicholas M.},
     title = {Formal groups and $p$-adic interpolation},
     booktitle = {Journ\'ees arithm\'etiques de Caen},
     series = {Ast\'erisque},
     pages = {55--65},
     publisher = {Soci\'et\'e math\'ematique de France},
     number = {41-42},
     year = {1977},
     mrnumber = {441928},
     zbl = {0351.14024},
     language = {en},
     url = {http://www.numdam.org/item/AST_1977__41-42__55_0/}
}