@article{PismaZhETF.91.3,
    title = {Bound on induced gravitational wave background \\ from primordial black holes},
    author = {Bugaev, E. V. and Klimai, P. A.},
    journal = {Письма в ЖЭТФ},
    volume = {91},
    issue = {1},
    pages = {3},
    year = {2010},
    doi = {},
    url = {http://jetpletters.ru/ps/0/article_28695.shtml},
}