1. Demain AL, Solomon NA (1981) Scientific American 245:67
2. Fleming A (1929) J Exp Pathol 10:226
3. Florey HW, Chain EB, Heatley NG, Jennings MA, Sanders AG, Abraham EP, Florey ME (1949) Antibiotics, Vol II. Oxford University Press, London
4. Backus MP, Stauffer JF (1955) Mycologia 47:429
5. Bu’Lock JD (1975) In: Smith JE, Berry R (eds) The filamentous fungi, vol 1. Wiley, New York, p 33