@article{AUCMP_1981__22_1_a4,
     author = {Kepka, Tom\'a\v{s}},
     title = {On a class of subdirectly irreducible groupoids},
     journal = {Acta Universitatis Carolinae. Mathematica et Physica},
     pages = {17--24},
     publisher = {mathdoc},
     volume = {22},
     number = {1},
     year = {1981},
     mrnumber = {0635973},
     zbl = {0478.08005},
     language = {en},
     url = {https://geodesic-test.mathdoc.fr/item/AUCMP_1981__22_1_a4/}
}