@article{VYURM_2015_7_3_a6,
     author = {M. M. Symotyuk and I. Y. Savka},
     title = {Metric estimates of small denominators in nonlocal boundary value problems},
     journal = {Vestnik \^U\v{z}no-Uralʹskogo gosudarstvennogo universiteta. Seri\^a, Matematika, mehanika, fizika},
     pages = {48--53},
     publisher = {mathdoc},
     volume = {7},
     number = {3},
     year = {2015},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VYURM_2015_7_3_a6/}
}