@article{oai:tohoku.repo.nii.ac.jp:00011174,
 author = {Hasegawa, Akira and Hamaguchi, Hiroyuki},
 issue = {2},
 journal = {Science reports of the Tohoku University. Ser. 5, Geophysics},
 month = {Jan},
 note = {application/pdf, 紀要類 (bulletin), 1525982 bytes},
 pages = {51--60},
 title = {The Masking Effect on Magnitude Distribution by the Successive Occurrence of Earthquakes.},
 volume = {21},
 year = {1972}
}