@article{MZM_1980_27_1_a1,
     author = {V. K. Kartashov},
     title = {Quasivarieties of unars},
     journal = {Matemati\v{c}eskie zametki},
     pages = {7--20},
     publisher = {mathdoc},
     volume = {27},
     number = {1},
     year = {1980},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1980_27_1_a1/}
}