@article{IM2_2009_73_2_a0,
     author = {A. G. Baskakov},
     title = {Spectral analysis of differential operators with unbounded operator-valued coefficients, difference relations and semigroups of difference relations},
     journal = {Izvestiya. Mathematics },
     pages = {215--278},
     publisher = {mathdoc},
     volume = {73},
     number = {2},
     year = {2009},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IM2_2009_73_2_a0/}
}