@article{ZNSL_1997_236_a20,
     author = {P. A. Terekhin},
     title = {Trigonometrical algebras},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {183--191},
     publisher = {mathdoc},
     volume = {236},
     year = {1997},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1997_236_a20/}
}