@article{10_21136_CMJ_1978_101564,
     author = {Jir\'askov\'a, Hana and Jir\'asko, Josef},
     title = {Generalized projectivity},
     journal = {Czechoslovak Mathematical Journal},
     pages = {632--646},
     publisher = {mathdoc},
     volume = {28},
     number = {4},
     year = {1978},
     doi = {10.21136/CMJ.1978.101564},
     mrnumber = {506436},
     zbl = {0377.16016},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.21136/CMJ.1978.101564/}
}