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@article{10_14708_cm_v18i2_5820, author = {Th. Friedrich}, title = {On an equality for 3-dimensional manifolds}, journal = {Commentationes Mathematicae}, pages = { 187--188}, publisher = {mathdoc}, volume = {18}, number = {2}, year = {1975}, doi = {10.14708/cm.v18i2.5820}, language = {pl}, url = {http://geodesic.mathdoc.fr/articles/10.14708/cm.v18i2.5820/} }
Th. Friedrich. On an equality for 3-dimensional manifolds. Commentationes Mathematicae, Tome 18 (1975) no. 2, pp. 187-188. doi : 10.14708/cm.v18i2.5820. http://geodesic.mathdoc.fr/articles/10.14708/cm.v18i2.5820/
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