@article{PismaZhETF.9.698,
    title = {The Sign of the Product of the Reduced Matrix  Elements of E2 Transitions Between the $0^+, 2^+$ and $2^+_2$ States in Even-even Nuclei},
    author = {Isakov, V. I. and Lemberg, I. Kh.},
    journal = {πΙΣΨΝΑ Χ φότζ},
    volume = {9},
    issue = {12},
    pages = {698},
    year = {1969},
    doi = {},
    url = {http://jetpletters.ru/ps/0/article_25433.shtml},
}