Close Determination of earthquake source parameters from waveform data for studies of global and regional seismicity,
Dziewonski, A. M., T. A. Chou, J. H. Woodhouse (1981) (1981),
Journal of Geophysical Research: Solid Earth, 86, B4 p. 2825–2852,
10.1029/JB086iB04p02825.