would require full access to the WoS database (Mogoutov & Kahane, 2007, p. 895),
and such an access was not available during this study. Two more realistic suggestions
would be to reiterate the citation based extension phase to increase recall, or try to use
BC or lexical coupling on a limited subset of articles downloaded from WoS, in order
to further expand the core set (e.g., the core journals could be used to delimit a subset
of articles, and by applying BC or lexical coupling, the core set could potentially be
expanded, which would increase recall in the subsequent phase of citation based
extension)