1. 1 J Brimacombe, AIJ Brain, and A Berry .The Laryngeal Mask Airway. Review and Practical Guide.London: WB Saunders, 1997 .
2. Comparison of four methods for assessing airway sealing pressure with the laryngeal mask airway in adult patients
3. 4 B Rosner . Hypothesis testing: categorical data . In:Fundamentals of Biostatistics.Belmont: Wadsworth Publishing Company, 1995 : 423-426.
4. 5 JL Fleiss . Reliability of measurements . In:The Design and Analysis of Clinical Experiments.New York: John Wiley and Sons, 1986 : 2-32.