C. Feng, A Tentative Study of Nonverbal Communicative Modes in Text-based SCMC, 2005.

X. Bing, To Book: from point to point, 2012.

L. Standing, Learning 10000 pictures, Quarterly Journal of Experimental Psychology, vol.12, issue.2, pp.207-222, 1973.
DOI : 10.1037/h0069812

L. E. King, A laboratory comparison of symbol and word roadway signs, Traffic Engineering and control, issue.10, pp.12-518, 1971.

R. E. Walker, R. C. Nicolay, and . Stearns-c-r, Comparative accuracy of recognizing American and international road signs., Journal of Applied Psychology, vol.49, issue.5, pp.49322-375, 1965.
DOI : 10.1037/h0022525

W. Horton, The icon book: Visual Symbols for computer Systems and Documentation, 1994.

R. Likert, A Technique for the Measurement of Attitudes, Archives of Psychology, vol.1932, issue.1, pp.1-55, 1932.

D. Gittens, Icon-based human-computer interaction, International Journal of Man-Machine Studies, vol.24, issue.6, 1968.
DOI : 10.1016/S0020-7373(86)80007-4

. Feng-zhiwei, Formal models of natural language processing, 2010.