@article{VUU_2009_3_a1,
     author = {E. I. Bravyi},
     title = {On the solvability of the periodic boundary value problem for a~linear functional differential equation},
     journal = {Vestnik Udmurtskogo universiteta. Matematika, mehanika, kompʹ\^uternye nauki},
     pages = {12--24},
     publisher = {mathdoc},
     number = {3},
     year = {2009},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VUU_2009_3_a1/}
}