1. B. Mason, in:Meteorites, (John Wiley and Sons, Inc., New York and London, 1962)
2. J.A. Wood, in:Meteorites and the Origin of Planets (McGraw-Hill, Inc., New York, 1968).
3. A.D. Romig and J.I. Goldstein, Met. Trans. 11A (1980) 1151.
4. R. Gooley, R.B. Merril and J.R. Smith, Meteoritics 10 (1975) 410.
5. J. Paulevé, D. Dautreppe, J. Laugier and L. Néel. C.R. Acad. Sci. Paris 254 (1962) 965; J. Phys. Radium 23 (1962) 841.