@article{DE_2004_40_4_a5,
     author = {A. S. Pechentsov and A. Yu. Popov},
     title = {Asymptotic {Behavior} of the {Density} of the {Spectral} {Measure} of the {Singular} {Sturm--Liouville} {Operator}},
     journal = {Differencialʹnye uravneni\^a},
     pages = {485--499},
     publisher = {mathdoc},
     volume = {40},
     number = {4},
     year = {2004},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_2004_40_4_a5/}
}