@article{MZM_2001_69_3_a10,
     author = {A. M. Savchuk and A. A. Shkalikov},
     title = {Trace {Formula} for {Sturm--Liouville} {Operators} with {Singular} {Potentials}},
     journal = {Matemati\v{c}eskie zametki},
     pages = {427--442},
     publisher = {mathdoc},
     volume = {69},
     number = {3},
     year = {2001},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_2001_69_3_a10/}
}