@article{SIGMA_2011_7_a111,
     author = {Andrey V. Sokolov},
     title = {Resolutions of {Identity} for {Some} {Non-Hermitian} {Hamiltonians.} {II.~Proofs}},
     journal = {Symmetry, integrability and geometry: methods and applications},
     year = {2011},
     volume = {7},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SIGMA_2011_7_a111/}
}