%0 Journal Article %A Klucký, Dalibor %T Isotopic invariants of natural planar ternary rings %J Mathematica Bohemica %D 1995 %P 325-335 %V 120 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.21136/MB.1995.126004/ %R 10.21136/MB.1995.126004 %G en %F 10_21136_MB_1995_126004