1. Noise Figures of Radio Receivers;Friis;Proceedings of the IRE,1944
2. Behavior of Noise Figure in Junction Transistors;Nielsen;Proceedings of the IRE,1957
3. Theory of Noisy Fourpoles;Rothe;Proceedings of IRE,1956
4. Noise in Transistor Circuits;Baxandall;Wireless World,1968