1. American Society of Anesthesiologists: Basic Standards for Preanesthesia Care,1993
2. American Society of Anesthesiologists: New classification of physical status;Anesthesiology,1963
3. American Society of Anesthesiologists: Standards for Basic Intra-operative Monitoring,1993
4. The hazard of anoxia during nitrous oxide anesthesia;Barach;Anesthesiology,1945