@article{10_21136_CMJ_1984_101978,
     author = {Koubek, V\'aclav},
     title = {Large systems of independent objects in concrete categories. {I}},
     journal = {Czechoslovak Mathematical Journal},
     pages = {506--527},
     publisher = {mathdoc},
     volume = {34},
     number = {4},
     year = {1984},
     doi = {10.21136/CMJ.1984.101978},
     mrnumber = {764435},
     zbl = {0606.18002},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.21136/CMJ.1984.101978/}
}