@article{PismaZhETF.81.60,
    title = {Real--time instantons and suppression of collision--induced tunneling},
    author = {Levkov, D. and Sibiryakov, S.},
    journal = {Письма в ЖЭТФ},
    volume = {81},
    issue = {2},
    pages = {60},
    year = {2005},
    doi = {},
    url = {http://jetpletters.ru/ps/0/article_9050.shtml},
}