• Author: Millesi, E. A. Strijkstra I. E. Hoffmann J. P. Dittami S. Daan
• Title: Sex and age differences in mass, morphology, and annual cycle in European ground squirrels, Spermophilus citellus.
• Year: 1999
• Reference Type: Journal Article
• Journal/Book Title: J.Mammal.
• Volume: 80
• Pages: 218-231
• Date of Publication: Monday, 20 December 1999