Article (leydesdorff2012alternatives)
Leydesdorff, L.
Alternatives to the Journal Impact Factor: I3 and the Top-10% (or Top-25%?) of the Most-Highly Cited Papers
Digital Libraries, 2012, 1201.4638

Misc (leydesdorff2010semantic)
Leydesdorff, L. & Welbers, K.
The semantic mapping of words and co-words in contexts
2010