@article{SM_1972_16_2_a10,
     author = {B. R. Vainberg},
     title = {On~eigenfunctions of an operator corresponding to the poles of the analytic continuation of the resolvent through the continuous spectrum},
     journal = {Sbornik. Mathematics},
     pages = {307--322},
     year = {1972},
     volume = {16},
     number = {2},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1972_16_2_a10/}
}