@article{DAN_1989_309_2_a16,
     author = {K. A. Lukin and Yu. L. Maistrenko and A. N. Sharkovskii and V. P. Shestopalov},
     title = {The method of difference equations in a resonator problem with a},
     journal = {Doklady Akademii Nauk},
     pages = {327--331},
     publisher = {mathdoc},
     volume = {309},
     number = {2},
     year = {1989},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1989_309_2_a16/}
}