@article {10.6180-100235663,
title = {Development of an Ultrasonic Drilling Machine with Portability},
author = {Wang, Hongbing and Sun, Chunhua},
volume = 22,
issue = 2,
year = 2019,
month = {6月},
pub_date = {2019-06-01},
pages = {239--248},
doi = {10.6180/jase.201906_22(2).0005},
url = {https://doi.org/10.6180/jase.201906_22(2).0005},
journal = {Journal of Applied Science and Engineering},
issn = {1560-6686},
publisher = {Tamkang University Press}
}