@article{PismaZhETF.5.341,
    title = {Coalescence of Boson Regge Trajectories at t $\leq$ 0},
    author = {Volkov, D. V.},
    journal = {Письма в ЖЭТФ},
    volume = {5},
    issue = {9},
    pages = {341},
    year = {1967},
    doi = {},
    url = {http://jetpletters.ru/ps/0/article_25190.shtml},
}