@article{PismaZhETF.68.255,
    title = {Ultra high energy cosmic rays, superheavy long-living particles, and matter creation after inflation},
    author = {Kuzmin, V. A. and Tkachev, I. I.},
    journal = {πΙΣΨΝΑ Χ φότζ},
    volume = {68},
    issue = {4},
    pages = {255},
    year = {1998},
    doi = {},
    url = {http://jetpletters.ru/ps/0/article_14707.shtml},
}