1. for a review see: D. Bimberg, M. Grundmann, and N. N. Ledentsov, Quantum Dot Heterostructures (Wiley, New York, 1999).
2. for a review see: Semiconductor Quantum Dots, Eds. Y. Masamoto and T. Takagahara, (Springer, Berlin, 2002).
3. R. J. Warburton B. T. Miller, C. S. Dürr, C. Bödefeld, K. Karrai, J. P. Kotthaus, G. Medeiros-Ribeiro, and P. M. Petroff, Phys. Rev. B 58, 16221 (1998).
4. L. He and A. Zunger, Phys. Rev. B 73, 115324 (2006).
5. E. E. Vdovin, A. Levin, A. Patanè, L. Eaves, P. C. Main, Yu. N. Khanin, Yu. V. Dubrovskii, M. Henini, and G. Hill, Science 290, 122 (2000).