@article{oai:repository.dl.itc.u-tokyo.ac.jp:00032964, author = {Tsujiura, Masaru}, issue = {1}, journal = {東京大學地震研究所彙報 = Bulletin of the Earthquake Research Institute, University of Tokyo}, month = {Jul}, note = {application/pdf}, pages = {65--134}, title = {3. Waveform and Spectral Features of Earthquake Swarms and Foreshocks : in Special Reference to Earthquake Prediction}, volume = {58}, year = {1983} }