@article{ZVMMF_1997_37_10_a4,
     author = {N. B. Konyukhova and I. B. Staroverova},
     title = {Modification of the phase method for singular selfadjoint {Sturm{\textendash}Liouville} problems},
     journal = {\v{Z}urnal vy\v{c}islitelʹnoj matematiki i matemati\v{c}eskoj fiziki},
     pages = {1183--1200},
     publisher = {mathdoc},
     volume = {37},
     number = {10},
     year = {1997},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZVMMF_1997_37_10_a4/}
}