The multibus interconnection network is an attractive solution for connecting processors and memory modules in a multiprocessor with shared memory. It provides a throughput which is intermediate between the single bus and the crossbar, with a corresponding intermediate cost.
Lang, T.; Valero, M.; Fiol, M. A. Reduction of connections for multibus organization. "IEEE transactions on computers", Agost 1983, vol. C-32, núm. 8, p. 707-716.