1. Principles of Tunnel Diode Circuits;Chow,1964
2. Principles of Transistor Circuits;Shea,1953
3. High-Frequency Negative-Resistance Circuit Principles for Esaki Diode Applications
4. L. I. Smilen and D. C. Youla, Proc. Nat. Electron. Conf. (U S A) 16 (1960)