@article{MZM_1977_21_2_a8,
     author = {M. M. Gekhtman},
     title = {Asymptotics of the eigenvalues of the {Dirichlet} and {Neumann} problems for the abstract {Sturm-Liouville} operator},
     journal = {Matemati\v{c}eskie zametki},
     pages = {209--212},
     publisher = {mathdoc},
     volume = {21},
     number = {2},
     year = {1977},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1977_21_2_a8/}
}