@article{ISU_2017_17_1_a0,
     author = {S. I. Mitrokhin},
     title = {Multipoint differential operators: ``splitting'' of the multiple in main eigenvalues},
     journal = {Izvestiya of Saratov University. Mathematics. Mechanics. Informatics},
     pages = {5--18},
     publisher = {mathdoc},
     volume = {17},
     number = {1},
     year = {2017},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ISU_2017_17_1_a0/}
}