1. Pitteri, M., On v + 1 lattices, J. Elasticity 15, 3?25 (1985).
2. Pitteri, M., On crystallographic space groups and generalized lattice groups, pending publication.
3. James, R. D., The stability and metastability of quartz, to appear in Proc. Workshop on Metastability and Partial Differential Equations, Minneapolis, 1985, to be published by Springer-Verlag.
4. Ericksen, J. L., ?The Cauchy and Born Hypotheses for Crystals?, in Phase Transformations and Material Instabilities in Solids (ed. M. E. scGurtin), New York: Academic Press, 1984.
5. Eftis, J., MacDonald, D. E. & Arkilic, G. M., Theoretical calculations on the pressure variation of second-order elastic coefficients for alkali metals, Mater. Sci. Eng. 7, 141?150 (1971).