@article{PismaZhETF.31.429,
    title = {Influence of the $\vec nn$-channel on the properties of a proton-antiproton atom},
    author = {Mur, V. D. and Kudryavtsev, A. E. and Popov, V. S.},
    journal = {πΙΣΨΝΑ Χ φότζ},
    volume = {31},
    issue = {7},
    pages = {429},
    year = {1980},
    doi = {},
    url = {http://jetpletters.ru/ps/0/article_20443.shtml},
}