@article{CMUC_1977__18_3_a11,
     author = {Vl\v{c}ek, Ivan},
     title = {On congruences of the lattices ${\rm Sub (L)}$},
     journal = {Commentationes Mathematicae Universitatis Carolinae},
     pages = {541--546},
     publisher = {mathdoc},
     volume = {18},
     number = {3},
     year = {1977},
     mrnumber = {0491384},
     zbl = {0367.06004},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CMUC_1977__18_3_a11/}
}