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@article{DAN_1989_307_2_a7, author = {I. M. Spitkovsky and A. M. Tashbaev}, title = {Factorization of piecewise constant matrix functions with $3$}, journal = {Doklady Akademii Nauk}, pages = {291--296}, publisher = {mathdoc}, volume = {307}, number = {2}, year = {1989}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1989_307_2_a7/} }
I. M. Spitkovsky; A. M. Tashbaev. Factorization of piecewise constant matrix functions with $3$. Doklady Akademii Nauk, Tome 307 (1989) no. 2, pp. 291-296. http://geodesic.mathdoc.fr/item/DAN_1989_307_2_a7/