P. Lutzelberger

System studies and basic design for an advanced series compensation scheme (ASC)

Norbert Christl, Kadry Sadek, P. Lutzelberger, 1991 .

AC/DC Harmonic Interaction in HVDC Systems

K. Sadek, P. Lutzelberger, N. Christl, 1992, ICHPS V International Conference on Harmonics in Power Systems..

System performance and design aspects for HVDC back-to-back ties without smoothing reactors

Norbert Christl, Kadry Sadek, H. Schmitt, 1990 .