@article{AUCMP_1988_29_2_a4,
     author = {Kipiani, A. E.},
     title = {Some combinatorial problems, connected with product-isomorphisms of binary relations},
     journal = {Acta Universitatis Carolinae. Mathematica et Physica},
     pages = {23--25},
     year = {1988},
     volume = {29},
     number = {2},
     mrnumber = {0983447},
     zbl = {0682.04002},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/AUCMP_1988_29_2_a4/}
}