1. Sohngen, N. L., Centralblatt fur Bakteriologie, Parasitenkunde und Infektionskrankheiten. 2 Abt 40: 87 (1914).
2. Spence, D., Industrial & Engineering Chemistry 28: 847 (1936).
3. UMBREIT, W.W., Studies on the proactinomyces, JOURNAL OF BACTERIOLOGY 38: 73 (1939).
4. ZOBELL, C.E., The effect of oxygen tension on the rate of oxidation of organic matter in sea water by bacteria, JOURNAL OF MARINE RESEARCH 3: 211 (1940).