@article{1102703429, author = {van der Woude, Jaap}, title = {Characterizations of (H)PI extensions.}, journal = {Pacific J. Math.}, volume = {120}, number = {2}, year = {1985}, pages = { 453-467}, language = {en}, url = {http://dml.mathdoc.fr/item/1102703429} }
van der Woude, Jaap. Characterizations of (H)PI extensions.. Pacific J. Math., Tome 120 (1985) no. 2, pp. 453-467. http://gdmltest.u-ga.fr/item/1102703429/