@article{AL_1993_32_3_a5,
     author = {A. G. Pinus and I. Chajda},
     title = {Quasi-orders on universal algebras},
     journal = {Algebra i logika},
     pages = {308--325},
     publisher = {mathdoc},
     volume = {32},
     number = {3},
     year = {1993},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/AL_1993_32_3_a5/}
}