@article{DAN_1990_313_4_a9,
     author = {Yu. S. Tumashev},
     title = {Definition of the convolution of inverse matrices defined in the},
     journal = {Doklady Akademii Nauk},
     pages = {816--820},
     publisher = {mathdoc},
     volume = {313},
     number = {4},
     year = {1990},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1990_313_4_a9/}
}