TY  - JOUR
AU  - Cheng, Zhiyun
TI  - The Chord Index, its Definitions, Applications, and Generalizations
JO  - Canadian journal of mathematics
PY  - 2021
SP  - 597
EP  - 621
VL  - 73
IS  - 3
UR  - http://geodesic.mathdoc.fr/articles/10.4153/S0008414X20000061/
DO  - 10.4153/S0008414X20000061
ID  - 10_4153_S0008414X20000061
ER  -