@article{RM_1981_36_2_a17,
     author = {O. A. Plaksina},
     title = {The characteristic of the~spectrum of some boundary-value problems for {the~Sturm--Liouville} operator},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {191--192},
     publisher = {mathdoc},
     volume = {36},
     number = {2},
     year = {1981},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/RM_1981_36_2_a17/}
}