California Oak Death Mortality Task Force: Sudden Oak Death. 2004. This comprehensive site describes issues with the disease in California, including disease incidence, symptoms, host range, regulatory information, links to current research, and nursery chronology.
Rizzo, D. M., Garbelotto, M., Davison, J. M., Slaughter, G. W., and Koide, S. T. 2002. Phytophthora ramorum as the cause of extensive mortality of Quercus spp. and Lithocarpus densiflorus in California. Plant Dis. 86:205-214.