References
- Smiley, G., “Ultra-low frequency, three-phase oscillator”, Proc. I.R.E., 42 (1954), 677.
- Armitage, M. D., “Ultra-low frequency oscillator”, Wireless Engineer, 32 (1955), 173.
- Howe, R. M. & Liste, R. J., “Low frequency oscillator”, Rev. Sci. Instruments, 24 (1953), 901.
- Kryloff & Bogoliuboff, Induction to Nonlinear Mechanics, 1949.
- Macnee, A. B., “Some limitation on the accuracy of the differential analyser”, Proc. I.R.E., 40 (1952), 303.