Wei Dong Peng Li A Parallel Harmonic-Balance Approach to Steady-State and Envelope-Following Simulation of Driven and Autonomous Circuits. 490-501 2009 28 IEEE Trans. on CAD of Integrated Circuits and Systems 4 http://dx.doi.org/10.1109/TCAD.2009.2014000 db/journals/tcad/tcad28.html#DongL09