1. P.K. Chatterjee, G.W. Taylor, J.E. Leiss; Proc. of the 11th Conference on Solid State Devicee, Tokyo 1979 pp. 209–212
2. A.G. Eldin, M.I. Elmasry; IEEE Journal of Solid State Circuits, Vol. SC-20, No. 3, June 1985, pp. 715–723
3. D. Temmler, K.E. Ehwald, W. Winkler, R. Barth, P. Schley ; 17th Yugoslav Conf. on Microelectronics, Miel, May 1989