@article{100394,
author = {Ludv\'\i k Jano\v s},
title = {Vyvod odnogo neravenstva dlia pervykh sobstvennykh znachenii dvukh kraevykh zadach},
journal = {Czechoslovak Mathematical Journal},
volume = {10},
year = {1960},
pages = {68-82},
zbl = {0101.06601},
mrnumber = {0116191},
language = {ru},
url = {http://dml.mathdoc.fr/item/100394}
}
Janoš, Ludvík. Вывод одного неравенства для первых собственных значений двух краевых задач. Czechoslovak Mathematical Journal, Tome 10 (1960) pp. 68-82. http://gdmltest.u-ga.fr/item/100394/