Oliveira, L. B., J. R. Fernandes, M. H. L. Kouwenhoven, C. van den Bos, and C. J. M. Verhoeven. "A quadrature relaxation oscillator-mixer in CMOS." Circuits and Systems, 2003. ISCAS'03. Proceedings of the 2003 International Symposium on. Vol. 1. IEEE, 2003. I–689. Abstract
Oliveira, L. B., J. R. Fernandes, I. M. Filanovsky, C. J. M. Verhoeven, and M. M. Silva. "Quadrature LC-Oscillator." Analysis and Design of Quadrature Oscillators (2008): 81-98. Abstract
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Oliveira, L. B., J. R. Fernandes, I. M. Filanovsky, C. J. M. Verhoeven, and M. M. Silva. "Quadrature Oscillator-Mixer." Analysis and Design of Quadrature Oscillators (2008): 63-80. Abstract
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Oliveira, L. B., J. R. Fernandes, I. M. Filanovsky, C. J. M. Verhoeven, and M. M. Silva. "Quadrature Relaxation Oscillator." Analysis and Design of Quadrature Oscillators (2008): 37-61. Abstract