1. The importance of montoring during operations on conjoined twins;Simpson;Can Med Assoc J,1967
2. Separation of conjoined thoracopagus twins, with the report of an additional case;Simpson;Can J Surg,1969
3. Emergency separation of thoracopagus conjoined twins conjoined at thorax in the newborn period: importance of careful preoperative cardiac evaluation;Simpson;Surgery,1970
4. Operative correction of caudal duplication (dipygus);Rowe;Surgery,1968