@article{FPM_2008_14_6_a3,
     author = {Yu. V. Zhuchok},
     title = {Endomorphism semigroups of 2-nilpotent binary relations},
     journal = {Fundamentalʹna\^a i prikladna\^a matematika},
     pages = {75--83},
     publisher = {mathdoc},
     volume = {14},
     number = {6},
     year = {2008},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/FPM_2008_14_6_a3/}
}