1. Nursing research: principles and methods;Polit,1991
2. Panel for the Prediction and Prevention of Pressure Ulcers in Adults,1992
3. Panel for the Prediction and Prevention of Pressure Ulcers in Adults,1992
4. Etiology and pathology of ischemic ulcers;Kosiak;Arch Phys Med Rehabil,1959
5. Treatment of Pressure Ulcers Guideline Panel,1994