@article{PismaZhETF.77.243,
    title = {Statefinder -- a new geometrical diagnostic of dark energy},
    author = {Sahni, V. and Saini, T. D. and Starobinsky, A. A. and Alam, U.},
    journal = {Письма в ЖЭТФ},
    volume = {77},
    issue = {5},
    pages = {243},
    year = {2003},
    doi = {},
    url = {http://jetpletters.ru/ps/0/article_213.shtml},
}