@article{ARM_1988_24_1_a3,
     author = {Berkovich, L. M.},
     title = {Canonical forms of ordinary linear differential equations},
     journal = {Archivum mathematicum},
     pages = {25--42},
     year = {1988},
     volume = {24},
     number = {1},
     mrnumber = {983005},
     zbl = {0672.34005},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/ARM_1988_24_1_a3/}
}