@article{PismaZhETF.60.731,
    title = {General expression for optical transition probabilities in the envelope-function approximation},
    author = {Szmulowicz, F.},
    journal = {πΙΣΨΝΑ Χ φότζ},
    volume = {60},
    issue = {10},
    pages = {731},
    year = {1994},
    doi = {},
    url = {http://jetpletters.ru/ps/0/article_20516.shtml},
}