@article{DM_1998_10_1_a3,
     author = {L. A. Sholomov},
     title = {Transitivity-preserving operators on relations},
     journal = {Diskretnaya Matematika},
     pages = {28--45},
     publisher = {mathdoc},
     volume = {10},
     number = {1},
     year = {1998},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DM_1998_10_1_a3/}
}