@misc{oai:repository.dl.itc.u-tokyo.ac.jp:00004143,
 author = {Matsumoto, Akikazu},
 month = {Feb},
 title = {K-Ar Age Determination for Quaternary Volcanic Rocks Based on the Mass Fractionation Correction Method : Methodology and its Application to Ontake and Aso Volcanoes},
 year = {1991}
}