Yijia Liu Jingjing Zhang Zhongzhe Xiao Grid Diagram Features for Automatic Pipa Fingering Technique Classification. 24-28 2019 ISCID (1) https://doi.org/10.1109/ISCID.2019.00013 conf/iscid/2019-1 db/conf/iscid/iscid2019-1.html#LiuZX19