The two oscillator circuits down below are appropriate for using crystal oscillators in sequence or parallel manner: Modeling of nonlinear micromechanical resonators and their simulation With all the harmonic‐equilibrium method PDF Style and design of resonators with the determination from the temperature coefficients of elastic constants of monocrystalline silicon Nd:GdVO4 https://www.hxcrystals.com/seokeywords/bulk-crystal-oscillator.html