@article{MZM_1991_50_1_a15,
     author = {L. A. Shuster},
     title = {A~priori estimates of solutions of the {Sturm--Liouville} equation and the {A.\,M.~Molchanov} criterion},
     journal = {Matemati\v{c}eskie zametki},
     pages = {131--138},
     publisher = {mathdoc},
     volume = {50},
     number = {1},
     year = {1991},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1991_50_1_a15/}
}