@article{AUPO_1994_33_1_a4,
     author = {Hala\v{s}, Radom{\'\i}r},
     title = {A note on homotopy in universal algebra},
     journal = {Acta Universitatis Palackianae Olomucensis. Facultas Rerum Naturalium. Mathematica},
     pages = {39--42},
     year = {1994},
     volume = {33},
     number = {1},
     mrnumber = {1385744},
     zbl = {0844.08008},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/AUPO_1994_33_1_a4/}
}