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Bielefeldt, Hartmut und Giessibl, Franz J. (1999) A simplified but intuitive analytical model for intermittent-contact-mode force microscopy based on Hertzian mechanics. Surface Science 440 (3), L863-L867.

Giessibl, Franz J., Bielefeldt, Hartmut, Hembacher, Stefan und Mannhart, Jochen (1999) Calculation of the optimal imaging parameters for frequency modulation atomic force microscopy. Applied Surface Science 140 (3-4), S. 352-357.