@article{PismaZhETF.5.357,
    title = {Nature of Concentration Quenching of the Luminescence of $Nd^{+++}$ Ions in Crystals},
    author = {Voron'ko, Yu. K. and Osiko, V. V.},
    journal = {πΙΣΨΝΑ Χ φότζ},
    volume = {5},
    issue = {10},
    pages = {357},
    year = {1967},
    doi = {},
    url = {http://jetpletters.ru/ps/0/article_25196.shtml},
}