@article{TM_2010_270_a13,
     author = {S. I. Mitrokhin},
     title = {Spectral properties of a~fourth-order differential operator with integrable coefficients},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {188--197},
     year = {2010},
     volume = {270},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TM_2010_270_a13/}
}