1. P.R. Louis et al., Method and apparatus for texturing a thermoplastic film, U.S. Patent 4259286, 1979.
2. T.H. Koger et al., Process for high-speed production of webs of debossed and perforated thermoplastic film, U.S. Patent 4552709, 1985.
3. F. Hanstein, T.P. Muench, Method for contouring the surface of thermoplastic synthetic resins, U.S. Patent 4038360, 1977.
4. Electrostatic forces and their effects on capacitive mechanical sensors;Puers;Sensors and Actuators A,1996
5. Electrostatically excited diaphragm driven as a loudspeaker;Rangsten;Sensors and Actuators A,1996