@article{ZVMMF_1969_9_4_a9,
     author = {H. \`E. \`El' Nadi},
     title = {The asymptotic theory of certain differential-difference equations and its applications},
     journal = {\v{Z}urnal vy\v{c}islitelʹnoj matematiki i matemati\v{c}eskoj fiziki},
     pages = {873--883},
     publisher = {mathdoc},
     volume = {9},
     number = {4},
     year = {1969},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZVMMF_1969_9_4_a9/}
}