TY - RPRT TI - Computer programs ASPAR, GSAS and ENAS and APROB for the statistical modeling of aftershock sequences and estimation of aftershock hazard AU - Paul Reasenberg PY - 1994 DO - 10.3133/ofr94221 UR - https://pubs.usgs.gov/publication/ofr94221 ID - ofr94221 ER -