@article{ZNSL_1980_93_a4,
     author = {A. V. Malyshev and U. M. Pachev},
     title = {On the arithmetic of matrices of second order},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {41--86},
     publisher = {mathdoc},
     volume = {93},
     year = {1980},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1980_93_a4/}
}