@article{AL_1981_20_3_a1,
     author = {V. S. Drenski},
     title = {A minimal basis for identities of a second-order matrix
},
     journal = {Algebra i logika},
     pages = {282--290},
     publisher = {mathdoc},
     volume = {20},
     number = {3},
     year = {1981},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/AL_1981_20_3_a1/}
}