@article{ISU_2016_16_2_a6,
     author = {V. S. Rykhlov},
     title = {Expansion in root functions of strongly irregular pencil of differential operators of the second order with multiple characteristics},
     journal = {Izvestiya of Saratov University. Mathematics. Mechanics. Informatics},
     pages = {165--174},
     publisher = {mathdoc},
     volume = {16},
     number = {2},
     year = {2016},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ISU_2016_16_2_a6/}
}