Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) OKAGUCHI Masako,Fission Track Dating of the Obsidians from Pyroclastic Flow Deposits,SECOND SERIES BULLETIN OF THE VOLCANOLOGICAL SOCIETY OF JAPAN,04534360,The Volcanological Society of Japan,1978,23,4,231-240,https://cir.nii.ac.jp/crid/1390282681097134080,https://doi.org/10.18940/kazanc.23.4_231