@article{MZM_1971_10_3_a3,
     author = {A. F. Leont'ev},
     title = {Infinite-order differential equations with analytic solutions},
     journal = {Matemati\v{c}eskie zametki},
     pages = {269--278},
     publisher = {mathdoc},
     volume = {10},
     number = {3},
     year = {1971},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1971_10_3_a3/}
}