1) H. Kuhn, D. Möbius, and H. Bücher, “Techniques of Chemistry,” Vol. 1, Part 3B, ed by A. Weissberger and B. W. Rossiter, Wiley, New York (1972), p. 577.
2) H. Bücher, K. H. Drexhage, M. Fleck, H. Kuhn, D. Möbius, F. P. Schäfer, J. Sondermann, W. Sperling, P. Tillmann, and J. Wiegand, Molecular Crystals, 2, 199 (1967).
3) K. B. Blodgett, J. Am. Chem. Soc., 56, 495 (1934);
K. B. Blodgett, J. Am. Chem. Soc., 57, 1007 (1935);