TY - RPRT TI - The complex frequencies of long-period seismic events as probes of fluid composition beneath volcanoes AU - Hiroyuki Kumagai AU - B. A. Chouet PY - 1999 DO - 10.1046/j.1365-246x.1999.00911.x UR - https://pubs.usgs.gov/publication/70021901 ID - 70021901 ER -