@article{PismaZhETF.25.569,
    title = {Concerning the problem of lasers for the far ultraviolet X ~ 500-700 A},
    author = {Ilyukhin, A. A. and Peregudov, G. V. and Ragozin, E. N. and Sobel'man, I. I. and Chirkov, V. A.},
    journal = {πΙΣΨΝΑ Χ φότζ},
    volume = {25},
    issue = {12},
    pages = {569},
    year = {1977},
    doi = {},
    url = {http://jetpletters.ru/ps/0/article_21489.shtml},
}