Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) TAI Hideo and YAMAMOTO Kazushige and ABE Takeshi and UEKI Takashi and TANAKA Hiroaki and UEHARA Kiyoji,Quantitative Remote Sensing of Methane Using an Intensity-Modulated Dual-Wavelength He-Ne Laser,Transactions of the Society of Instrument and Control Engineers,0453-4654,The Society of Instrument and Control Engineers,1988,24,5,452-458,https://cir.nii.ac.jp/crid/1390282679481422592,https://doi.org/10.9746/sicetr1965.24.452