@article{CMUC_1989_30_2_a0,
     author = {Je\v{z}ek, Jaroslav and Slav{\'\i}k, V\'aclav},
     title = {Free lattices over halflattices},
     journal = {Commentationes Mathematicae Universitatis Carolinae},
     pages = {203--211},
     year = {1989},
     volume = {30},
     number = {2},
     mrnumber = {1014120},
     zbl = {0696.06004},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CMUC_1989_30_2_a0/}
}