@conference {kannan2020material,
	title = {Material mapping in unknown environments using tapping sound},
	booktitle = {2020 IEEE/RSJ International Conference on Intelligent Robots and Systems (IROS)},
	year = {2020},
	pages = {4855{\textendash}4861},
	publisher = {IEEE},
	organization = {IEEE},
	author = {Kannan, Shyam Sundar and Jo, Wonse and Parasuraman, Ramviyas and Min, Byung-Cheol}
}
