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@article{10_4064_cm_38_1_39, author = {A. R. D. Mathias}, title = {A solution of a problem of {B.} {Rotman}}, journal = {Colloquium Mathematicum}, pages = {39--39}, publisher = {mathdoc}, volume = {38}, number = {1}, year = {1977}, doi = {10.4064/cm-38-1-39}, language = {en}, url = {http://geodesic.mathdoc.fr/articles/10.4064/cm-38-1-39/} }
A. R. D. Mathias. A solution of a problem of B. Rotman. Colloquium Mathematicum, Tome 38 (1977) no. 1, p. 39. doi : 10.4064/cm-38-1-39. http://geodesic.mathdoc.fr/articles/10.4064/cm-38-1-39/
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