1. K.-H. Herrmann, D. Krahl, A. Klibler, K.-H. Müller, V. Rindfleisch: In Electron Microscopy in Material Science ed. by U. Valdrè ( Academic Press, New York and London 1971 ) pp. 237–272
2. J.G. Graeme: Application of Operational Amplifiers ( McGraw-Hill, New York ) 1973 )
3. Y.J. Wong, W.E. Ott: Function Circuit Design and Applications ( McGraw-Hill, New York 1976 )
4. C.E. Fiori, H. Yakowitz, D. E. Newbury: Scannina Electron Microsc. 74, 167– 174 (1974)
5. D.E. Newbury: Scanning Electron Microsc. 75, 727–736 (1975)