H. G. Zhang, A. V. Holden, I. Kodama, H. Honjo, M. Lei, T. Varghese and M. R. Boyett. Mathematical models of action po- tentials in the periphery and center of the rabbit sinoatrialnode. American Journal of Physiology—Heart and Circulatory Physi- ology, 2000, 279(1): 397-403.