@article{DAN_1992_322_3_a7,
     author = {A. S. Makin},
     title = {On {Riesz} means of biorthogonal expansions in root functions of nonselfadjoint extensions of the {Schr\"odinger} operator},
     journal = {Doklady Akademii Nauk},
     pages = {472--475},
     publisher = {mathdoc},
     volume = {322},
     number = {3},
     year = {1992},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1992_322_3_a7/}
}