@article{MZM_2015_97_6_a2,
     author = {A. A. Vladimirov and E. S. Karulina},
     title = {A {Priori} {Lower} {Bound} for the {Minimal} {Eigenvalue} of a {Sturm{\textendash}Liouville} {Problem} with {Boundary} {Conditions} of the {Second} {Type}},
     journal = {Matemati\v{c}eskie zametki},
     pages = {832--840},
     year = {2015},
     volume = {97},
     number = {6},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_2015_97_6_a2/}
}