@article{MZM_1986_40_2_a4,
     author = {A. I. Vahabov},
     title = {Completeness of the eigenfunctions of irregular differential operators in a space of vector-valued functions},
     journal = {Matemati\v{c}eskie zametki},
     pages = {197--202},
     publisher = {mathdoc},
     volume = {40},
     number = {2},
     year = {1986},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1986_40_2_a4/}
}