@article{AA_2001_13_6_a1,
     author = {T. Ehrhardt and I. M. Spitkovsky},
     title = {Factorization of piecewise constant matrix functions and systems of linear differential equations},
     journal = {Algebra i analiz},
     pages = {56--123},
     publisher = {mathdoc},
     volume = {13},
     number = {6},
     year = {2001},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/AA_2001_13_6_a1/}
}