Ten-Year Cross-Disciplinary Comparison of the Growth of Open Access and How it Increases Research Citation Impact. - Chawki Hajjem; Stevan Harnad; Yves Gingras (IEEE Data Eng. Bull., 2005)

Citation Advantage For OA Self-Archiving Is Independent of Journal Impact Factor, Article Age, and Number of Co-Authors - Chawki Hajjem; Stevan Harnad (CoRR, 2007)

The Open Access Citation Advantage: Quality Advantage Or Quality Bias? - Chawki Hajjem; Stevan Harnad (CoRR, 2007)

Self-Selected or Mandated, Open Access Increases Citation Impact for Higher Quality Research - Yassine Gargouri; Chawki Hajjem; Vincent Larivière; Yves Gingras; Les Carr; Tim Brody; Stevan Harnad (CoRR, 2010)