(en) Giovanni Muttoni, Giancarlo Scardia et Dennis V. Kent, « A critique of evidence for human occupation of Europe older than the Jaramillo subchron (~1 Ma): comment on 'The oldest human fossil in Europe from Orce (Spain)' by Toro-Moyano et al. (2013) », Journal of Human Evolution, (DOI10.1016/j.jhevol.2013.08.005, lire en ligne)
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(en) Giovanni Muttoni, Giancarlo Scardia et Dennis V. Kent, « A critique of evidence for human occupation of Europe older than the Jaramillo subchron (~1 Ma): comment on 'The oldest human fossil in Europe from Orce (Spain)' by Toro-Moyano et al. (2013) », Journal of Human Evolution, (DOI10.1016/j.jhevol.2013.08.005, lire en ligne)