@article{DAN_1972_203_6_a1,
     author = {M. G. Gasymov and M. G. Dzhavadov},
     title = {Multiple completeness of a part of the set of eigenfunctions and adjoint functions of differential operator bundles},
     journal = {Doklady Akademii Nauk},
     pages = {1235--1237},
     publisher = {mathdoc},
     volume = {203},
     number = {6},
     year = {1972},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1972_203_6_a1/}
}