@article{DAN_1980_252_6_a3,
     author = {A. I. Vagabov},
     title = {Multiple summability in eigen- and associated functions for nonregular differential bundles},
     journal = {Doklady Akademii Nauk},
     pages = {1300--1303},
     publisher = {mathdoc},
     volume = {252},
     number = {6},
     year = {1980},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1980_252_6_a3/}
}