@article{FAA_2009_43_1_a5,
     author = {I. M. Karabash and A. S. Kostenko},
     title = {On the {Similarity} of a $J${-Nonnegative} {Sturm--Liouville} {Operator} to a {Self-Adjoint} {Operator}},
     journal = {Funkcionalʹnyj analiz i ego prilo\v{z}eni\^a},
     pages = {81--84},
     publisher = {mathdoc},
     volume = {43},
     number = {1},
     year = {2009},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/FAA_2009_43_1_a5/}
}