@article{VMUMM_1989_3_a22,
     author = {Buǐ Ta Long},
     title = {Eigenvalues of quadratic operator pencils that are connected with problems of stability},
     journal = {Vestnik Moskovskogo universiteta. Matematika, mehanika},
     pages = {74--76},
     publisher = {mathdoc},
     number = {3},
     year = {1989},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VMUMM_1989_3_a22/}
}