1. A totally implantable artificial heart; anatomical space availability;Urzua;Proceedings of 25th ACEMB,1972
2. 2. Annual Progress Report, “Available Space for a Totally Implantable Cardiac Prosthesis,” COO-2208-3, April 1973, The Cleveland Clinic Foundation.
3. A rationally designed artificial heart for calves;Urzua;Trans Am Soc Artif Intern Organs,1974
4. Preliminary report. Anatomic constraints for the implantation of an artificial heart;Urzua;J Surg Res,1974
5. 5. Annual Progress Report, “Available Space for a Totally Implantable Cardiac Prosthesis,” COO-2208-6, April 1974, The Cleveland Clinic Foundation.