REFERENCES
- Frankl V E.. Man's Search for Meaning. New York, Pocket Books, Simon and Schuster. 1985
- Toledo-Pereyra L H.. Epocas de la Cirugia. Toledo-Pereyra L H.. Cirugia, Arte y Cultura., JGH Editores. Editorial de Cienca y Cultura Latinoamericana, Mexico, DF 1998; 15