@article{ZNSL_2003_303_a12,
     author = {D. S. Chelkak},
     title = {The asymptotics of spectral data of the harmonic oscillator perturbed by a~potential},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {223--271},
     publisher = {mathdoc},
     volume = {303},
     year = {2003},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_2003_303_a12/}
}