On the unsuitability of WoS and Scopus for Computer Science
A recent article points out all the troubles concerning such reference databases when the evaluation of the research in Computer Science is involved
B. de Sutter, A. Van den Oord. To be or no to be cited in Computer Science, Communications of ACM, Aug 2012.
Here a significant fragment of the paper:
"ACM, Scopus, and WoS must develop better reference-parsing technology to fix the significant undercitation in their databases. Due to the variations in undercitation, the ACM DL, Scopus, and WoS, and even combinations thereof, are unreliable information sources for the most commonly used citation-based metrics in CS. Moreover, Scopus and WoS databases reflect a significant bias against covered conference proceedings, resulting in underestimation of their impact."
Have a nice reading