1. A review of the present status of preoperative hemoglobin requirements;Kowlyshyn;Anesth Analg,1972
2. The minimum acceptable level of hemoglobin;Allen;Int Anesthesiol Clin,1982
3. Preoperative Blood Transfusion;NIH Consensus Conference,1988
4. Beilage zum centralblatt fur Chirugie;Miculicz,1890
5. Oxygen Transport and Utilization;Bryan-Brown,1987