@article{PismaZhETF.7.105,
    title = {Symmetry of Relativistic Problems},
    author = {Malkin, I. A. and Man'ko, V. I.},
    journal = {πΙΣΨΝΑ Χ φότζ},
    volume = {7},
    issue = {3},
    pages = {105},
    year = {1968},
    doi = {},
    url = {http://jetpletters.ru/ps/0/article_25589.shtml},
}