1. H. Frank , T. Petterson “Thyristor-switched shunt capacitors and their modelling for transmission applications.” Paper No.A 78 105 – 9 ,presented at IEEE Winter Power Meeting, 1977 .
2. K. Engberg , H. Frank , S. Torseng “Reactors and Capacitors controlled by thyristors for optimum power system control,” presented at EPRI Seminar on Transmission Static VAR Systems , Oct. 24 – 25 – 1978 .