@article{PismaZhETF.45.67,
    title = {Measurements of the absolute frequency of a He-Ne/$CH_4$ laser},
    author = {Bagaev, S. N. and Klement'ev, V. M. and Chebotaev, V. P.},
    journal = {πΙΣΨΝΑ Χ φότζ},
    volume = {45},
    issue = {2},
    pages = {67},
    year = {1987},
    doi = {},
    url = {http://jetpletters.ru/ps/0/article_18675.shtml},
}