@article{DAN_1989_309_1_a5,
     author = {M. V. Korovina},
     title = {Cauchy problems for overdetermined systems of linear differential},
     journal = {Doklady Akademii Nauk},
     pages = {31--34},
     year = {1989},
     volume = {309},
     number = {1},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1989_309_1_a5/}
}