@article{ZNSL_1987_160_a7,
     author = {V. A. Gritsenko},
     title = {Arithmetic of quaternions and {Eisenstein} series},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {82--90},
     year = {1987},
     volume = {160},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1987_160_a7/}
}