@article{MZM_1974_16_2_a15,
     author = {Yu. M. Vazhenin},
     title = {The cardinalities of semigroups of isotonic transformations of reflexive graphs},
     journal = {Matemati\v{c}eskie zametki},
     pages = {317--323},
     publisher = {mathdoc},
     volume = {16},
     number = {2},
     year = {1974},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1974_16_2_a15/}
}