@article{AUPO_1991__30_1_a1,
     author = {Rach\r{u}nek, Ji\v{r}{\'\i}},
     title = {The ordinal variety of distributive ordered sets of width two},
     journal = {Acta Universitatis Palackianae Olomucensis. Facultas Rerum Naturalium. Mathematica},
     pages = {17--32},
     publisher = {mathdoc},
     volume = {30},
     number = {1},
     year = {1991},
     mrnumber = {1166422},
     zbl = {0773.06006},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/AUPO_1991__30_1_a1/}
}