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| 2 | 2- A. V. Ziel, “Solid State Physical Elect.”, Prentice Hall Inc. New Jersey, 7, 136- 144, 1968. |
| 3 | 3- M. Shuer, “Physics of Semiconductor Devices”, Prentice-Hall, Int. Inc., New Jersey, 2, 194-225, 1990. |
| 4 | 4- S. M. Sze, “VLSI Technology”, McGraw-Hill Book Co., 2, 70-82, 1988 |