@article{PismaZhETF.42.456,
    title = {Observation in $TmFeO_3$ of direct electronic transitions inside the principal multiplet of a rare-earth ion},
    author = {Balbashov, A. M. and Volkov, A. A. and Kozlov, G. V. and Lebedev, S. P. and Mukhin, A. A. and Pronin, A. Yu. and Prokhorov, A. S. and Prokhorov, A. M.},
    journal = {πΙΣΨΝΑ Χ φότζ},
    volume = {42},
    issue = {11},
    pages = {456},
    year = {1985},
    doi = {},
    url = {http://jetpletters.ru/ps/0/article_21890.shtml},
}