LUDOVIC ORLANDO, MARYAM MACHKOUR, ARIANE BURKE, CHRISTOPHE J. DOUADY, VÉRA EISENMANN and CATHERINE HÄNNI: Geographic distribution of an extinct equid (Equus hydruntinus: Mammalia, Equidae) revealed by morphological and genetical analyses of fossils. Molecular Ecology
Volume 15 Issue 8 Page 2083-2093, July 2006. online
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Ariane Burke, Vera Eisenmann and Graeme K. Ambler: The systematic position of Equus hydruntinus, an extinct species of Pleistocene equid. Quaternary Research, Volume 59, Issue 3, May 2003, Pages 459-469. online