Schaub R., Prinzinger R. Long-term telemetry of heart rates and energy metabolic rate during the diurnal cycle in normothermic and torpid African blue-naped mousebirds (Urocolius macrourus) (англ.) // Comparative Biochemistry and Physiology; Part A: Molecular & Integrative Physiology. — 1999. — Vol. 124, no. 9. — P. 439—445. — doi:10.1016/S1095-6433(99)00136-1.