@article{IVM_2022_7_a8,
     author = {D. M. Polyakov},
     title = {Spectral estimates for fourth-order differential operator with periodic coefficients},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {86--92},
     publisher = {mathdoc},
     number = {7},
     year = {2022},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_2022_7_a8/}
}