@article{PismaZhETF.47.548,
    title = {Low-energy Lagrangian for pseudoscalar mesons and the linear $\sigma$ model},
    author = {Andreev, I. V. and Tsypin, M. M.},
    journal = {πΙΣΨΝΑ Χ φότζ},
    volume = {47},
    issue = {11},
    pages = {548},
    year = {1988},
    doi = {},
    url = {http://jetpletters.ru/ps/0/article_16587.shtml},
}