1. S. Linn, “Methods in Enzymology,” Vol. XII, Part A, ed. by L. Grossman and K. Moldave, Academic Press Inc., New York. N.Y., 1968, p. 247.
2. I. Mahler, “Methods in Enzymology,” Vol. XII, Part A, ed. by L. Grossman and K. Moldave, Academic Press Inc., New York, N.Y., 1967, p. 693.
3. A. Torriani, “Procedures in Nucleic Acid Research,” ed. by G. L. Cantoni and D.R.Davis, Harper & Row Publishers, 1966, p. 224.
4. M. Laskowski, SR.ibid., p. 170.