@article{PismaZhETF.27.149,
    title = {Conversion of He-IMe laser radiation from $\lambda$ = $3.39\mu$ m to the 330.5 nm band in sodium vapor},
    author = {Arkhipkin, A. G. and Popov, A. K. and Timofeev, V. P.},
    journal = {πΙΣΨΝΑ Χ φότζ},
    volume = {27},
    issue = {3},
    pages = {149},
    year = {1978},
    doi = {},
    url = {http://jetpletters.ru/ps/0/article_23661.shtml},
}