@article{AUPO_1996__35_1_a4,
     author = {Chajda, Ivan},
     title = {Congruence semimodularity of conservative groupoids},
     journal = {Acta Universitatis Palackianae Olomucensis. Facultas Rerum Naturalium. Mathematica},
     pages = {43--45},
     publisher = {mathdoc},
     volume = {35},
     number = {1},
     year = {1996},
     mrnumber = {1485042},
     zbl = {0957.08002},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/AUPO_1996__35_1_a4/}
}