an option

s.u.
The following definition is found in Cabell's Directory of Publishing Opportunities in Educational Psychology and Administration, David W.E. Cabell, Editor, 6th edition, 2002-2003 on page XIV.

With some exceptions a refereed article is one that is blind reviewed and has two external reviewers. The blind review requirement and the use of external reviewers are consistent with the research criteria of objectivity and of knowledge.

The use of a blind review process means that the author of the manuscript is not made known to the reviewers. With the large number of reviewers and journals, it is also likely that the name of the reviewers for a particular manuscript is not made know to the author. Thus, creating a double blind review process. Since the author and reviewers are frequently unknown, the manuscript is judged on its merits rather than on the reputation of the author and/or the author's influence on the reviewers.

The use of two (2) reviewers permits specialists familiar with research similar to that presented in the paper to judge whether the paper makes a contribution to the advancement of knowledge. When two reviewers are used it provides a broader perspective for evaluating the research. This perspective is further widened by the discussion between the editor and reviewers in seeking to reconcile these perspectives.

ist der englische Alternativausdruck zu "refereed" und wird meist (in den verschiedensten Schreibweisen) ins Deutsche übernommen, in der Regel übrigens als "peer-reviewed Journals" und kaum als "peer-reviewed Artikel" bzw. "Beiträge" o.Ä. - in deinem Fall also, etwas frei übersetzt "hat über 25 Beiträge in peer-reviewed Journals veröffentlicht"

Could this be a typo. Are these refered articles? His colleagues refer to his articles many times?