@article{CMUC_1982_23_2_a4,
     author = {Pasztor, A.},
     title = {The epis of ${\rm Pos} (Z)$},
     journal = {Commentationes Mathematicae Universitatis Carolinae},
     pages = {285--299},
     year = {1982},
     volume = {23},
     number = {2},
     mrnumber = {664973},
     zbl = {0502.06002},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CMUC_1982_23_2_a4/}
}