@article{DAN_1981_259_2_a6,
     author = {F. G. Maksudov and \`E. \`E. Pashaeva},
     title = {On multiple expansion in eigenfunctions, taking account of spectral singularities},
     journal = {Doklady Akademii Nauk},
     pages = {287--289},
     publisher = {mathdoc},
     volume = {259},
     number = {2},
     year = {1981},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1981_259_2_a6/}
}