@article{DAN_1965_165_5_a8,
     author = {B. M. Shain},
     title = {Semigroups of rectangular binary relations},
     journal = {Doklady Akademii Nauk},
     pages = {1011--1014},
     year = {1965},
     volume = {165},
     number = {5},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1965_165_5_a8/}
}