Kachur, S., R. N. Carleton, and G. Asmundson. “Fear of Falling: Taijiquan as a Form of Graded in Vivo Exposure Therapy”. Revista de Artes Marciales Asiáticas, vol. 2, no. 2, July 2012, pp. 36-45, doi:10.18002/rama.v2i2.299.