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@article{MZ_1969__112_171248, author = {David L. Johnson}, title = {Non-nilpotent {Elements} of {Cohomology} {Rings.}}, journal = {Mathematische Zeitschrift}, pages = {364--374}, publisher = {mathdoc}, volume = {112}, year = {1969}, zbl = {0179.32105}, url = {http://geodesic.mathdoc.fr/item/MZ_1969__112_171248/} }
David L. Johnson. Non-nilpotent Elements of Cohomology Rings.. Mathematische Zeitschrift, Tome 112 (1969), pp. 364-374. http://geodesic.mathdoc.fr/item/MZ_1969__112_171248/