@article{MMO_1980_41_a6,
     author = {M. S. Agranovich},
     title = {Convergence of series in root vectors of operators that are nearly selfadjoint},
     journal = {Trudy Moskovskogo matemati\v{c}eskogo ob\^{s}estva},
     pages = {163--180},
     publisher = {mathdoc},
     volume = {41},
     year = {1980},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MMO_1980_41_a6/}
}