1. Clinical experience with an implantable pacemaker;Chardack, W.M.; Gage, A.A.; Federico, A.J.; Schimert, G.; Greatbatch, W.;Ann. N. Y. Acad. Sci,1964
2. Cardiac pacemakers;Davies, J.G.; Sowton, G.E.;Phys. in Med. Biol,1964
3. Siddons, A. H. M., and Sowton, G. E. (1967). Cardiac Pacemakers. Thomas, Springfield, Ill., U.S.A.