@article{CMH_1978__53_139731,
     author = {U. Stammbach and D.W. Barnes and P. Schmid},
     title = {Cohomological characterisations of saturated formations and homomorphs of finite groups.},
     journal = {Commentarii mathematici Helvetici},
     pages = {165--173},
     year = {1978},
     volume = {53},
     zbl = {0383.20032},
     url = {http://geodesic.mathdoc.fr/item/CMH_1978__53_139731/}
}