@article{GDZPPN002055015,
title = {Relations between cohomology groups in a complex.},
journal = {Commentarii mathematici Helvetici},
volume = {21},
year = {1948},
pages = {302-320},
zbl = {0031.18103},
url = {http://dml.mathdoc.fr/item/GDZPPN002055015}
}
Eilenberg, Samuel. Relations between cohomology groups in a complex.. Commentarii mathematici Helvetici, Tome 21 (1948) pp. 302-320. http://gdmltest.u-ga.fr/item/GDZPPN002055015/