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@article{ARM_1991__27_3-4_a0, author = {Chronowski, Antoni}, title = {On extensions of homomorphisms and homotopies of commutative $n$-adic groups}, journal = {Archivum mathematicum}, pages = {139--148}, publisher = {mathdoc}, volume = {27}, number = {3-4}, year = {1991}, mrnumber = {1189208}, zbl = {0781.20039}, language = {en}, url = {http://geodesic.mathdoc.fr/item/ARM_1991__27_3-4_a0/} }
Chronowski, Antoni. On extensions of homomorphisms and homotopies of commutative $n$-adic groups. Archivum mathematicum, Tome 27 (1991) no. 3-4, pp. 139-148. http://geodesic.mathdoc.fr/item/ARM_1991__27_3-4_a0/