@article{DAN_1997_353_3_a6,
     author = {Ya. N. Fel'd},
     title = {On a new quadratic lemma for nonmonochromatic processes of},
     journal = {Doklady Akademii Nauk},
     pages = {316--319},
     publisher = {mathdoc},
     volume = {353},
     number = {3},
     year = {1997},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1997_353_3_a6/}
}