1. Rasmussen, R. A. & Khalil, M. A. K. Nature 300, 700 (1983).
2. Zimmerman, P. R., Greenberg, J. P., Wandiga, S. O. & Crutzen, P. J. Science 218, 563–565 (1982).
3. Becker, G. in The Biology of Termites, Vol. 1 (eds Krishna, K. & Weesner, F. M.) 351–385 (Academic, New York, 1969).
4. Peakins, G. J. & Josens, G. in The Biology of Termites Vol. 1 (eds Krishna, K. & Weesner, F. M.) 111–163 (Academic, New York, 1969).
5. Wood, T. G. & Sands, W. A. in The Biology of Termites Vol. 1 (eds Krishna, K & Weesner, F. M.) 242–292 (Academic, New York, 1969).