@article{1255456056, author = {Peterson, F. P. and Stein, N.}, title = {The dual of a secondary cohomology operation}, journal = {Illinois J. Math.}, volume = {4}, number = {1}, year = {1960}, pages = { 397-404}, language = {en}, url = {http://dml.mathdoc.fr/item/1255456056} }
Peterson, F. P.; Stein, N. The dual of a secondary cohomology operation. Illinois J. Math., Tome 4 (1960) no. 1, pp. 397-404. http://gdmltest.u-ga.fr/item/1255456056/