Vasanth Bala Shlomo Kipnis Marc Snir Jehoshua Bruck Robert Cypher Pablo Elustondo Alex Ho Ching-Tien Ho CCL: A Portable and Tunable Collective Communication Library for Scalable Parallel Computers. 835-844 1994 conf/ipps/1994 IPPS db/conf/ipps/ipps1994.html#BalaKSBCEHH94