Solid state physics in electronics and telecommunications; proceedings of an international conference held in Brussels, June 2-7, 1958., 4v.; v1. semiconductors part 1, v2. semiconductors part 2, v3. magnetic and optical properties part 1, v4. magnetic and optical properties part 2. - Désirant, M., ed; Michiels, J. L., ed (Academic Press, 1960)