@article{IVM_1987_4_a12,
     author = {A. G. Terent'ev},
     title = {A remark on the closedness of linear functional-differential operators},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {68--71},
     publisher = {mathdoc},
     number = {4},
     year = {1987},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1987_4_a12/}
}