Corrections and clarifications.
References related to citation 2 include J. A. Sepulchre and A. Babloyantz, Phys. Rev. E 48, 187 (1993); A. Babloyantz and J. A. Sepulchre, Physica D 49, 52 (1991); and J. A. Sepulchre and A. Babloyantz, Phys. Rev. Lett. 66, 1314 (1991).