P. Kalaivani, D. Hanirex, и D. Kaliyamurthie. International Journal on Recent and Innovation Trends in Computing and Communication, 3 (3):
1142--1144(марта 2015)
D. Kuettel, M. Breitenstein, L. Van Gool, и V. Ferrari. Proceedings of CVPR'10: IEEE Conference on Computer Vision and Pattern Recognition, San Francisco, CA, USA, стр. 1951-1958. (2010)
D. Carraher, и D. Earnest. Proceedings of the 2003 Joint Meeting of PME and PMNA (PME27 and PME-NA25), 2, стр. 173--180. 1776 University Av., Honolulu, HI 96822, International Group for the Psychology of Mathematics Education, College of Education, University of Hawai'i, (июля 2003)