@article{AL_1992_31_3_a3,
     author = {Andrzej Orlicki},
     title = {On a concept of a binary relation over partial enumerated sets},
     journal = {Algebra i logika},
     pages = {306--318},
     year = {1992},
     volume = {31},
     number = {3},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/AL_1992_31_3_a3/}
}