@article{1183524398, author = {Kristensen, Leif}, title = {On the cohomology of two-stage Postnikov systems}, journal = {Bull. Amer. Math. Soc.}, volume = {67}, number = {6}, year = {1961}, pages = { 597-602}, language = {en}, url = {http://dml.mathdoc.fr/item/1183524398} }
Kristensen, Leif. On the cohomology of two-stage Postnikov systems. Bull. Amer. Math. Soc., Tome 67 (1961) no. 6, pp. 597-602. http://gdmltest.u-ga.fr/item/1183524398/