1. D. G. Cooney and R. Emerson, “Thermophilic Fungi,” W. H. Freeman and Company, San Francisco, 1964, p. 17.
2. H. B. Hicks, J. S. Strathern and I. Hawskozitz, “DNA Insertion Elements, Plasmids and Episomes,” A. I. Bukhari, J. A. Shapiro and S. L. Adhya, Cold Spring Harbor, New York, 1977, p. 457.