1. A. Zunger, in Solid State Physics, Ed. by H. Ehrenreich and D. Turnbull (Academic, Orland, CA, United States, 1986), Vol. 39, p. 275.
2. K. A. Kikoin and V. N. Fleurov, Transition Metal Impurities in Semiconductors: Electronic Structure and Physical Properties (World Scientific, Singapore, 1994).
3. V. I. Sokolov, Fiz. Tekh. Poluprovodn. (St. Petersburg) 28(4), 545 (1994) [Semiconductors 28 (4), 329 (1994)].
4. K. R. Kittilstved, W. K. Liu, and D. R. Gamelin, Nat. Mater. 5, 291 (2006).
5. J. M. Coey, M. Venkatesan, and C. B. Fitzgerald, Nat. Mater. 4, 173 (2005).