@article{DAN_1965_162_6_a2,
     author = {M. {\CYRA}. Barnovska},
     title = {Asymptotic representation of the spectral matrix of a fourth-order differential operator},
     journal = {Doklady Akademii Nauk},
     pages = {1223--1225},
     publisher = {mathdoc},
     volume = {162},
     number = {6},
     year = {1965},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1965_162_6_a2/}
}