| 1 | Jen¨o Sólyom, Fundamentals of the Physics of Solids, Volume I, 2007, Springer |
| 2 | Haug-Massey-Haar, Theoretical Solid State Physics, Volume I and II, 1972, Pergamon Press. |
| 3 | P.J.Mulders and W. Ubachs, The Structer of Matter, Vrije Universiteit Amsterdam |
| 4 | C. Kittel, Introduction to Solid State Physiscs,Wiley. |