Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) 長久保 白 and Ogi Hirotsugu,Propagation properties of longitudinal wave in defect-free multilayer graphene at low temperatures and high magnetic field,Proceedings of Symposium on Ultrasonic Electronics,,,2022,43,,,https://cir.nii.ac.jp/crid/1010298668258165767,