@article{MZM_1978_24_2_a8,
     author = {V. M. Zubov},
     title = {Closure property of the generalized {Green's} matrices of linear differential operators},
     journal = {Matemati\v{c}eskie zametki},
     pages = {217--229},
     publisher = {mathdoc},
     volume = {24},
     number = {2},
     year = {1978},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1978_24_2_a8/}
}