@article{ISU_2005_5_1_a4,
     author = {A. M. Minkin and A. P. Khromov},
     title = {{\CYRO}{\cyrp} regularity of self-adjoint boundary conditions},
     journal = {Izvestiya of Saratov University. Mathematics. Mechanics. Informatics},
     pages = {48--61},
     publisher = {mathdoc},
     volume = {5},
     number = {1},
     year = {2005},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ISU_2005_5_1_a4/}
}