@article{PismaZhETF.20.430,
    title = {Particle spectrum in quantum field theory},
    author = {Polyakov, A. M.},
    journal = {πΙΣΨΝΑ Χ φότζ},
    volume = {20},
    issue = {6},
    pages = {430},
    year = {1974},
    doi = {},
    url = {http://jetpletters.ru/ps/0/article_27297.shtml},
}