@article{MZM_1996_60_3_a10,
     author = {G. A. Aigunov},
     title = {On the boundedness problem for the set of orthonormal eigenfunctions for a~class of {Sturm--Liouville} operators with a~weight function of unbounded variation on a~finite interval},
     journal = {Matemati\v{c}eskie zametki},
     pages = {434--437},
     publisher = {mathdoc},
     volume = {60},
     number = {3},
     year = {1996},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1996_60_3_a10/}
}