@article{ISU_2014_14_2_a2,
     author = {V. B. Didenko},
     title = {About reversibility states of linear differential operators with periodic unbounded operator coefficients},
     journal = {Izvestiya of Saratov University. Mathematics. Mechanics. Informatics},
     pages = {136--144},
     publisher = {mathdoc},
     volume = {14},
     number = {2},
     year = {2014},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ISU_2014_14_2_a2/}
}