@article{GDZPPN002235366, title = {A Relative cohomological invariant for group pairs.}, journal = {Manuscripta mathematica}, volume = {83}, year = {1994}, pages = {1-18}, zbl = {0837.20061}, url = {http://dml.mathdoc.fr/item/GDZPPN002235366} }
Andrade, M.G.C.; Fanti, E.L.C. A Relative cohomological invariant for group pairs.. Manuscripta mathematica, Tome 83 (1994) pp. 1-18. http://gdmltest.u-ga.fr/item/GDZPPN002235366/