Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) Masanori Sato and Urumu Tsunogai and Jun-ichiro Ishibashi,"Carbon Isotope Measurement of Extremely Low Amounts of CH4:Application to Volcanic Gases From Satsuma-Iwojiia,japan",Analytical Sciences,09106340,Tokyo : Japan Society for Analytical Chemistry,1999-06,15,6,513-516,https://cir.nii.ac.jp/crid/1520853832565549824,