@article{CMH_1971__46_139482,
     author = {B. Eckmann and P.J. Hilton},
     title = {On {Central} {Group} {Extensions} and {Homology}},
     journal = {Commentarii mathematici Helvetici},
     pages = {345},
     publisher = {mathdoc},
     volume = {46},
     year = {1971},
     zbl = {0232.18011},
     language = {un},
     url = {https://geodesic-test.mathdoc.fr/item/CMH_1971__46_139482/}
}