1. Constant-current sine-wave circuits for stimulation;Guttmann;Am. J. Psychol.,1957
2. A comparison of the Lilly waveform and the sixty-cycle sine wave;Miller,1961
3. A constant sixty-cycle sine-wave current stimulator for physiological experimentation;Montgomery;Electronics,1951
4. A sine wave constant-current biological stimulator;Roth;Med. Res. Eng.,1967