A Systematic Review of Modifications and Validation Methods for the Extension of the Keystroke-Level Model

Table 5

Digital search results resulting from applying the search string to the selected digital libraries. The numbers in parentheses show the number of unique articles.

Digital Source	Potential	Preliminary Selection	Final Selection
ACM digital library	44	23	18
Scopus	62	29	17
Springer Link	212	22	16
Elsevier Science Direct	184	17	5
Web of Science	31	10	10
Taylor and Francis on-line	67	12	4
IEEE Xplore digital library	93	7	5
Google Scholar	1751	118	62
Total	2444	238 (149)	137 (66)