@article{10_21136_CMJ_1989_102290,
     author = {Chajda, Ivan},
     title = {Principal tolerances on lattices},
     journal = {Czechoslovak Mathematical Journal},
     pages = {176--180},
     year = {1989},
     volume = {39},
     number = {1},
     doi = {10.21136/CMJ.1989.102290},
     mrnumber = {1014538},
     zbl = {0678.06004},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.21136/CMJ.1989.102290/}
}