1. J Cibert, P M Petroff, G J Dolan, D J Werder, S J Pearton, A C Gossard and J H English, Superlattices and Microstructures, 3 35 (1987) and H Temkin, G J Dolan, M B Panish and S N G Chu, Appl Phys Lett, 50, 413 (1987) and references therein.
2. A Forchel, H Leier, B E Maile and R German, Festkörperprobleme, 28, 99 (1988) and references therein
3. Y Hirayama and H Okamoto in: “Physics and Technology of Submicron Structures”, Springer Series in Solid State Sciences, 83, p. 45 Eds. H Heinrich, G Bauer and F Kuchar (Springer, Berlin, 1988 ).
4. see, for example, S R Andrews et al in this volume
5. S P Beaumont in: “Nanostructure Physics and Fabrication”, Eds M A Reed and W P Kirk, Academic Press (in press)