@article{ZNSL_1983_132_a0,
     author = {A. Sh. Abakarov and A. V. Yakovlev},
     title = {The identities of a~triangular extension},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {5--11},
     publisher = {mathdoc},
     volume = {132},
     year = {1983},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1983_132_a0/}
}