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Primary source: www.ffclrp.usp.br/docentes/sdoc.php?cusp=196_LzFA4hkq8DJPbhn5ZPYXrKAeArolTRoehy9v8JI

Verified locator: Primary university named profile; Área de Pesquisa: rodent physiological/behavioral aspects in phylogeny/evolution; Principais produções includes Social System and Spatial Organization of Wild Guinea Pigs (Cavia aperea) in a Natural Population. Primary indexed text verified; direct open returned cache miss. No personal dates or current appointment asserted.

Journal of Mammalogy 85(4), 788–796 (2004), DOI 10.1644/BNS-012. Printed p. 788 supplies the title above and the byline Matthias Asher, Elisabeth Spinelli de Oliveira and Norbert Sachser. The institutional export instead abbreviates the first author as Asher MR; the printed paper explicitly names Matthias Asher. A six-month southeastern-Brazil field study combined radiotelemetry, direct observation and DNA fingerprinting. The abstract's historical assertion about domestic-guinea-pig ancestry is not treated as evidence from this field study.