Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) ,evelopment of a 1. 9-THz Band Hot-Electron Bolometer Heterodyne Receiver with a Quantum Cascade Laser,Proceedings of 21st International Symposium on Space Terahertz Technology 21th(in press),,,2010,,,,https://cir.nii.ac.jp/crid/1010000782463186944,