@article{FPM_2008_14_8_a3,
     author = {Ya. Diasamidze and Sh. Makharadze},
     title = {Complete semigroups of binary relations defined by $X$-semilattices of unions},
     journal = {Fundamentalʹna\^a i prikladna\^a matematika},
     pages = {73--99},
     publisher = {mathdoc},
     volume = {14},
     number = {8},
     year = {2008},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/FPM_2008_14_8_a3/}
}