@article{756336,
      author = {Koshmanenko, Volodymyr, and Dudkin, Mykola, and  Koshmanenko, Nataliia,},
      url = {http://library.usi.edu/record/756336},
      title = {The method of rigged spaces in singular perturbation  theory of self-adjoint operators [electronic resource] /},
      recid = {756336},
      pages = {1 online resource (xx, 237 pages) :},
}