R. V. Book,Rewriting techniques and applications,RTA 91.Rewriting techniques and applications(4th : 1991 : Italy):International Conference RTA-91, Como. Italy 1991, proceedings.Springer,1991.
E. G. Book,IEEE-GMTT International Microwave Symposium.IEEE-GMTT International Microwave Symposium (1972 : Arlington Heights):digest of technical papers.IEEE,1972.