@article{AL_2003_42_6_a7,
     author = {V. A. Khudyakov},
     title = {Quasivarieties of {Metric} {Algebras}},
     journal = {Algebra i logika},
     pages = {747--762},
     year = {2003},
     volume = {42},
     number = {6},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/AL_2003_42_6_a7/}
}