@article{AUPO_1994__33_1_a1,
     author = {Chajda, Ivan},
     title = {Principal tolerances on lattices},
     journal = {Acta Universitatis Palackianae Olomucensis. Facultas Rerum Naturalium. Mathematica},
     pages = {17--22},
     publisher = {mathdoc},
     volume = {33},
     number = {1},
     year = {1994},
     mrnumber = {1385741},
     zbl = {0844.08004},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/AUPO_1994__33_1_a1/}
}