Dahlem, M. A., Graf, R., Strong, A. J., Dreier, J. P., Dahlem, Y. A., Sieber, M., et al. (2010). Two-dimensional wave patterns of spreading depolarization: Retracting, re-entrant, and stationary waves. Physica D - Nonlinear Phenomena, 239(11), 889-903. doi:10.1016/j.physd.2009.08.009.