@article{IM2_1976_10_1_a5,
     author = {S. A. Akopyan and I. O. Khachatryan},
     title = {On the closure of nonclosed systems of functions of {Mittag-Leffler} type},
     journal = {Izvestiya. Mathematics },
     pages = {93--110},
     publisher = {mathdoc},
     volume = {10},
     number = {1},
     year = {1976},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IM2_1976_10_1_a5/}
}