On the spectrum of the quadratic pencil of differential operators with periodic coefficients on the semi-axis
Crossref DOI link: https://doi.org/10.1186/s13661-015-0380-y
Published Online: 2015-07-14
Published Print: 2015-12
Update policy: https://doi.org/10.1007/springer_crossmark_policy
Orujov, Ashraf D
License valid from 2015-07-14