@article{10_21136_CMJ_1985_102030,
     author = {Crvenkovi\'c, Sini\v{s}a and Dudek, J\'ozef},
     title = {Rectangular groupoids},
     journal = {Czechoslovak Mathematical Journal},
     pages = {405--414},
     publisher = {mathdoc},
     volume = {35},
     number = {3},
     year = {1985},
     doi = {10.21136/CMJ.1985.102030},
     mrnumber = {803035},
     zbl = {0596.20061},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.21136/CMJ.1985.102030/}
}