@article{PismaZhETF.18.646,
    title = {Analyticity of the forward elastic scattering amplitude with respect to the square of the scattered-particle mass},
    author = {Geshkenbein, B. V. and Ioffe, B. L.},
    journal = {πΙΣΨΝΑ Χ φότζ},
    volume = {18},
    issue = {10},
    pages = {646},
    year = {1973},
    doi = {},
    url = {http://jetpletters.ru/ps/0/article_24054.shtml},
}