Thermochron ibuttons: an inexpensive method for long-term recording of core body temperature in untethered animals.
Davidson AJ, Aujard F, London B, Menaker M, Block GD. Thermochron ibuttons: an inexpensive method for long-term recording of core body temperature in untethered animals. J Biol Rhythms. 2003 Oct; 18(5):430-2.