1. LHCb collaboration LHCb Technical Proposal, CERN/LHCC 98-4, 1998.
2. H. Dijkstra, T. Ruf, The L1 vertex trigger algorithm and its performance, LHCb 98-006, 1998.
3. M. Koratzinos, P. Mato, An all-software implementation of the vertex trigger, LHCb 98-022, 1998.