@article{ZNSL_2000_270_a17,
     author = {M. M. Faddeev and R. G. Shterenberg},
     title = {On the similarity of some singular differential operators to selfadjoint ones},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {336--349},
     publisher = {mathdoc},
     volume = {270},
     year = {2000},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_2000_270_a17/}
}