Steele C, Zivkovic B, Siopes T, Underwood H. Ocular clocks are tightly coupled and act as pacemakers in the circadian system of Japanese quail. American journal of physiology. Regulatory, integrative and comparative physiology 284 (1) , R208-18 (2003) (Epub 03 Oct 2002) PubMed ID:(12388441)

Underwood H, Steele C, Zivkovic B. Circadian organization and the role of the pineal in birds. Microscopy research and technique 53 (1) , 48-62 (2001) PubMed ID:(11279670)

Zivkovic B, Underwood H, Siopes T. Circadian ovulatory rhythms in Japanese quail: role of ocular and extraocular pacemakers. Journal of biological rhythms 15 (2) , 172-83 (2000) PubMed ID:(10762035)

Underwood H, Steele C, Zivkovic B. Effects of fasting on the circadian body temperature rhythm of Japanese quail. Physiology & behavior 66 (1) , 137-43 (1999) PubMed ID:(10222486)

Zivkovic B, Underwood H, Steele C, Edmonds K. Formal properties of the circadian and photoperiodic systems of Japanese quail: phase response curve and effects of T-cycles. Journal of biological rhythms 14 (5) , 378-90 (1999) PubMed ID:(10511005)