V. G. Verbitskiy, T. M. Virozub, A. F. Voschinkin, V. I. Zolotarevskiy, V. L. Samotovka, and L. I. Samotovka, “Features of high-frequency CMOS IС designing for generators with quartz frequency stabilization”, TKEA, no. 4, pp. 20-23, Aug. 2011.