@article{RCM_1973__7_181598,
     author = {C. Ruiz Salguero and R. Ruiz},
     title = {Kann fibrations which are homomorphisms of simplicial groups},
     journal = {Revista colombiana de matematicas},
     pages = {23--44},
     publisher = {mathdoc},
     volume = {7},
     year = {1973},
     zbl = {0267.55024},
     url = {http://geodesic.mathdoc.fr/item/RCM_1973__7_181598/}
}