1. 1976 Annual Book of ASTM Standards (American Society for Testing and Materials, Philadelphia, 1976), Part 42, E334–68, p. 257.
2. Spectroscopic Methods of Identification of Microquantities of Organic Materials
3. Potts W. J.Jr., Chemical Infrared Spectroscopy, Vol. I, Techniques (Wiley, New York, 1963), pp. 205, 232 ff.