@article{PismaZhETF.6.874,
    title = {Nature of Gravitational Field},
    author = {Polievktov-Nikoladze, N. M.},
    journal = {πΙΣΨΝΑ Χ φότζ},
    volume = {6},
    issue = {9},
    pages = {874},
    year = {1967},
    doi = {},
    url = {http://jetpletters.ru/ps/0/article_25517.shtml},
}