@article{VMUMM_2018_3_a4,
     author = {O. B. Arushanyan and S. F. Zaletkin},
     title = {Justification of some approach to implementation of orthogonal expansions for approximate integration of canonical systems of second order
},
     journal = {Vestnik Moskovskogo universiteta. Matematika, mehanika},
     pages = {29--33},
     publisher = {mathdoc},
     number = {3},
     year = {2018},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VMUMM_2018_3_a4/}
}