@article{PFMT_2013_3_a12,
     author = {I. P. Martynov and O. N. Parmanchuk and V. M. Pecevich},
     title = {On a cross system of two differential equations},
     journal = {Problemy fiziki, matematiki i tehniki},
     pages = {79--83},
     publisher = {mathdoc},
     number = {3},
     year = {2013},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/PFMT_2013_3_a12/}
}