%0 Journal Article %A Chajda, Ivan %T Principal tolerances on lattices %J Czechoslovak Mathematical Journal %D 1989 %P 176-180 %V 39 %N 1 %U http://geodesic.mathdoc.fr/articles/10.21136/CMJ.1989.102290/ %R 10.21136/CMJ.1989.102290 %G en %F 10_21136_CMJ_1989_102290