@article{PismaZhETF.78.1247,
    title = {Time-resolved photo-phonon spectroscopy of exchange     coupled Cr$^{3+}$~-- pairs in ruby},
    author = {Shegeda, A. M. and Lisin, V. N.},
    journal = {πΙΣΨΝΑ Χ φότζ},
    volume = {78},
    issue = {11},
    pages = {1247},
    year = {2003},
    doi = {},
    url = {http://jetpletters.ru/ps/0/article_1917.shtml},
}