1. Cairns-Smith, A. G, 1985, Los primeros organismos.

BibTeX
@misc{cairnssmith1985the1,
    author = "Cairns-Smith, A. G",
    title = "The first organisms",
    year = "1985",
    howpublished = "Scientific American, v. 252, no. 6, p. 90-100",
    note = "talkorigins\_source = {true}; raw\_reference = {Cairns-Smith, A. G., 1985, The first organisms: Scientific American, v. 252, no. 6, p. 90-100.}"
}

2. Butler, R. N. y Austad, S. N. y Barzilai, N. y Braun, A. y Helfand, S. y Larsen, P. L. y McCormick, A. M. y Perls, T. T. y Shuldiner, A. R. y Sprott, R. L. y Warner, H. R., 2003, Genes de longevidad: de organismos primitivos a humanos: The Journals of Gerontology Series A: Biological Sciences and Medical Sciences: v. 58, no. 7: p. B581-B584.

BibTeX
@article{butler2003longevity,
    author = "Butler, R. N. and Austad, S. N. and Barzilai, N. and Braun, A. and Helfand, S. and Larsen, P. L. and McCormick, A. M. and Perls, T. T. and Shuldiner, A. R. and Sprott, R. L. and Warner, H. R.",
    title = "Longevity Genes: From Primitive Organisms to Humans",
    year = "2003",
    journal = "The Journals of Gerontology Series A: Biological Sciences and Medical Sciences",
    url = "https://doi.org/10.1093/gerona/58.7.b581",
    doi = "10.1093/gerona/58.7.b581",
    number = "7",
    pages = "B581-B584",
    volume = "58"
}