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@article{MM2_1969__1_153970, author = {Hans-Berndt Brinkmann}, title = {Baer {Addition} of {Extensions.}}, journal = {Manuscripta mathematica}, pages = {99--110}, publisher = {mathdoc}, volume = {1}, year = {1969}, zbl = {0164.01303}, url = {http://geodesic.mathdoc.fr/item/MM2_1969__1_153970/} }
Hans-Berndt Brinkmann. Baer Addition of Extensions.. Manuscripta mathematica, Tome 1 (1969), pp. 99-110. http://geodesic.mathdoc.fr/item/MM2_1969__1_153970/