@article {qian2019design,
	title = {Design of an ultrasonic concentrator for vibro-tactile sensors using electro-mechanical analogy},
	journal = {International Journal of Precision Engineering and Manufacturing},
	volume = {20},
	number = {10},
	year = {2019},
	pages = {1787{\textendash}1800},
	publisher = {Korean Society for Precision Engineering},
	author = {Qian, Yanjun and Han, Sang-Wook and Kwon, Hyock-Ju}
}
