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@article{MS2_1982__50_166786, author = {Erik Christensen}, title = {Extensions of derivations {II.}}, journal = {Mathematica Scandinavica}, pages = {111--122}, publisher = {mathdoc}, volume = {50}, year = {1982}, zbl = {0503.47032}, url = {http://geodesic.mathdoc.fr/item/MS2_1982__50_166786/} }
Erik Christensen. Extensions of derivations II.. Mathematica Scandinavica, Tome 50 (1982), pp. 111-122. http://geodesic.mathdoc.fr/item/MS2_1982__50_166786/