• Author: Muller, W. T. G. Groothuis C. M. Eising S. Daan C. Dijkstra
• Title: Within clutch co-variation of egg mass and sex in the black-headed gull
• Year: 2005
• Reference Type: Journal Article
• Journal/Book Title: J Evol Biol
• Volume: 18
• Issue: 3
• Pages: 661-8
• Date of Publication: Tuesday, 20 December 2005