1. Fischbach D.B. (chapter 1) and A. Pacault (chapter 2) in vol. 7 “Chemistry and Physics of Carbon” (New York, Marcel Dekker - 1971)
2. Oberlin A,, Carbon, 17 (1979), 7–20
3. Oberlin A., J. Goma, J.N. Rouzaud, Proc. Intern. Carbon. Conf. Bordeaux 1984 - in print. J. Chim. Phys. (1985) 81, 701
4. Maire J. and J. Mering, “Chemistry and Physics of Carbon” (New York, Marcel Dekker - 1970 ), vol. 6, p. 125
5. Mering J., Acta Cryst., 2 (1949), 371–7