@article{AL_2018_57_3_a1,
     author = {D. K. Kabylzhanova},
     title = {Positive preorders},
     journal = {Algebra i logika},
     pages = {279--284},
     year = {2018},
     volume = {57},
     number = {3},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/AL_2018_57_3_a1/}
}