@article{DAN_1990_310_1_a5,
     author = {A. K. Prikarpatskii and N. N. Bogolyubov},
     title = {A bilocal periodic problem for {Sturm--Liouville} and {Dirac} differential operators, and some applications in the theory of nonlinear dynamical systems},
     journal = {Doklady Akademii Nauk},
     pages = {29--32},
     publisher = {mathdoc},
     volume = {310},
     number = {1},
     year = {1990},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1990_310_1_a5/}
}