1. U. Amaldi, Exptl. Tech. In High Energy Physics, p. 257, ed. T. Ferbel, Addison Wesley, 1987. Also in Phys. Scripta 23 (1981) 409.
2. C. W. Fabjan, Exptl. Tech. In High Energy Physics, p. 325,ed. T. Ferbel, Addison Wesley, 1987.
3. R. Wigmans, Ann. Rev. Nucl. And Part. Sci. 41 (1991) 133.
4. C. W. Fabjan and R. Wigmans, CERN-EP/89-64 (1989).
5. T. S. Virdee, Proc. 2nd Intl. Conf. On Calorimetry in High Energy Physics, p3, Capri, 1991, ed. A Ereditato, World Scientific.