Vulnerability to reentry, and Drift, Stability and breakdown of Spiral Waves in a Linear Gradient of Gk in a Luo-rudy 1 Virtual Ventricular Tissue. - Oleg V. Aslanidi; Richard H. Clayton; Arun V. Holden; H. K. Phillips; R. J. Ward (Int. J. Bifurc. Chaos, 2003)