Operating Experience with Modulation of the Pacific HVDC Intertie Cresap, R. L. ; Mittelstadt, W. A. ; Scott, D. N. ; Taylor, C. W. Abstract Publication: IEEE Transactions on Power Apparatus Systems Pub Date: July 1978 DOI: 10.1109/TPAS.1978.354584 Bibcode: 1978ITPAS..97.1053C