@article{PismaZhETF.6.531,
    title = {The Structure of the Gravitational Lagrangian},
    author = {Polievktov-Nikoladze, N. M.},
    journal = {πΙΣΨΝΑ Χ φότζ},
    volume = {6},
    issue = {2},
    pages = {531},
    year = {1967},
    doi = {},
    url = {http://jetpletters.ru/ps/0/article_25256.shtml},
}