(en) Lauren Sallan, Matt Friedman, Robert S. Sansom, Charlotte M. Bird, Ivan J. Sansom, « The nearshore cradle of early vertebrate diversification », Science, vol. 362, no 6413, , p. 460-464 (DOI10.1126/science.aar3689).
(en) T. Sigurdsen, D.M. Green, « The origin of modern amphibians: a re-evaluation », Zoological Journal of the Linnean Society, vol. 162, no 2, , p. 457–469 (DOI10.1111/j.1096-3642.2010.00683.x).