1. Wager, L. R. & Brown, G. M. Layered Igneous Rocks (Oliver & Boyd, Edinburgh, 1967).
2. Hess, G. B. Geol. Soc. Am. Mem. 132, 503–520 (1972).
3. Yoder, H. S. Jr (ed.) The Evolution of the Igneous Rocks: 50th Anniversary Perspectives (Princeton University Press, 1979).
4. Chen, C. F. & Turner, J. S. J. geophys. Res. (in the press).
5. McBirney, A. R. J. Volcanol. geotherm. Res. (in the press).