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Mayr, Gerald; Richter, Gotthard (25 de febrero de 2011). «Exceptionally preserved plant parenchyma in the digestive tract indicates a herbivorous diet in the Middle Eocene bird Strigogyps sapea (Ameghinornithidae)». Paläontologische Zeitschrift85 (3): 303-307. ISSN1867-6812. doi:10.1007/s12542-010-0094-5.