@article{PismaZhETF.52.1037,
    title = {Laser beams with screw dislocations in their wavefronts},
    author = {Bazhenov, V. Yu. and Vasnetsov, M. V. and Soskin, M. S.},
    journal = {πΙΣΨΝΑ Χ φότζ},
    volume = {52},
    issue = {8},
    pages = {1037},
    year = {1990},
    doi = {},
    url = {http://jetpletters.ru/ps/0/article_17529.shtml},
}