Hardebeck, Jeanne (2002). "A new method for determining first-motion focal mechanisms". Bulletin of the Seismological Society of America. 92 (6): 2264–2276. Bibcode:2002BuSSA..92.2264H. doi:10.1785/0120010200.
Hardebeck, Jeanne (2002). "A new method for determining first-motion focal mechanisms". Bulletin of the Seismological Society of America. 92 (6): 2264–2276. Bibcode:2002BuSSA..92.2264H. doi:10.1785/0120010200.