1. “Varactor Applications.”;Penfield,1962
2. The potential of semiconductor diodes in high-frequency communications;Uhlir;Proc. IRE,1958
3. Maximum cutoff frequency of varactor diodes;Penfield;Proc. IEEE,1965
4. Fourier coefficients of power-law devices;Penfield;J. Franklin Inst.,1962
5. Tables and formulas for calculating Fourier coefficients of power-law devices;Penfield;Mass. Inst. Technol. Res. Lab. Electron,1962