Piggins, H. D., & Loudon, A. (2005). ‘Circadian biology: clocks within clocks’, Current Biology, 15 (12), R 455–R 457.
358
Kishkinev, D., Chernetsov, N., & Mouritsen, H. (2010). ‘A Double-Clock or Jetlag Mechanism is Unlikely to be Involved in Detection of East—West Displacements in a Long-Distance Avian Migrant’, The Auk, 127 (4). P. 773–780.