Sung Woo Chung Seong Tae Jhang Chu Shik Jhon PANDA: Ring-Based Multiprocessor System Using New Snooping Protocol. 10-17 1998 ICPADS http://dlib.computer.org/conferen/icpads/8603/pdf/86030010.pdf db/conf/icpads/icpads1998.html#ChungJJ98