@incollection{AST_1979__63__73_0,
    author = {Hazewinkel, Michiel},
    title = {On formal groups. {The} functional equation lemma and some of its applications},
    booktitle = {Journ\'ees de G\'eom\'etrie Alg\'ebrique de Rennes - (Juillet 1978) (I) : Groupe formels, repr\'esentations galoisiennes et cohomologie des vari\'et\'es de caract\'eristique positive},
    series = {Ast\'erisque},
    pages = {73--82},
    publisher = {Soci\'et\'e math\'ematique de France},
    number = {63},
    year = {1979},
    mrnumber = {563461},
    zbl = {0423.14028},
    language = {en},
    url = {http://www.numdam.org/item/AST_1979__63__73_0/},
    date-added = {2024-4-18 14:3:50 +0100}
}

@incollection{AST_1979__63__73_0, author = {Hazewinkel, Michiel}, title = {On formal groups. {The} functional equation lemma and some of its applications}, booktitle = {Journ\'ees de G\'eom\'etrie Alg\'ebrique de Rennes - (Juillet 1978) (I) : Groupe formels, repr\'esentations galoisiennes et cohomologie des vari\'et\'es de caract\'eristique positive}, series = {Ast\'erisque}, pages = {73--82}, publisher = {Soci\'et\'e math\'ematique de France}, number = {63}, year = {1979}, mrnumber = {563461}, zbl = {0423.14028}, language = {en}, url = {http://www.numdam.org/item/AST_1979__63__73_0/}, date-added = {2024-4-18 14:3:50 +0100} }