* Streeter, D. D. Jnr, Powers, W. E., Ross, Alison M., and Torrent-Guasp, F. (1976). "Three-dimensional fibre-orientation in the mammalian left ventricular wall', in Cardiovascular System Dynamics, eds. J. Baan, A. Nordergraaf, and J. Raines, M.I.T. Press, Cambridge, Mass.