1. Alfonso F, Ambrosio G, Pinto FJ, et al. European National Society Cardiovascular Journals. Background, rationale and mission statement of the ''Editors' Club'' (Task Force of the European Society of Cardiology). Heart 2008;94:e19.
2. Alfonso F, Ambrosio G, Pinto FJ, et al. European Society of Cardiology national cardiovascular journals: the 'editors' network'. Eur Heart J 2010;31:26-8.
3. Alfonso F, Timmis A, Pinto FJ, et al. Editors' Network European Society of Cardiology Task Force. Conflict of interest policies and disclosure requirements among European Society of Cardiology National Cardiovascular Journals. Eur Heart J 2012;33:587-94.
4. Mills P, Timmis A, Huber K, et al. The role of European national journals in education. Heart 2009;95:e3.
5. Timmis AD, Alfonso F, Ambrosio G, et al. Editors' Network. National Society Cardiovascular Journals of Europe: Almanac 2011. Heart 2011;97:1819.
6. Alfonso F, Bermejo J, Segovia J. Impactology, impactitis, impactotherapy. Rev Esp Cardiol 2005;58:1239-45.
7. Bjork B-C, Welling P, Laakso M, et al. Open access to the scientific journal literature: situation 2009. PLoS ONE 2010;5:e11273.
8. Van Aalst J. Using Google Scholar to estimate the impact of journal articles in education. Educ Res 2010;39:387-400.
9. Falagas ME, Pitsouni EI, Malietzis GA, et al. Comparison of PubMed, Scopus, Web of Science, and Google Scholar: Strengths and weaknesses. FASEB J 2008;22:338-42.
10. Kulkarni AV, Aziz B, Shams I, et al. Comparisons of citations in Web of Science, Scopus, and Google Scholar for articles published in general medical journals. JAMA 2009;302:1092-6.
11. Alfonso F. The long pilgrimage of Spanish biomedical journals toward excellence. Who helps? Quality, impact and research merit. Endocrinol Nutr 2010;57:110-20.
12. Merton RK. The Matthew effect in science. The reward and communication systems of science are considered. Science 1968;159:56-63.
13. Brody T, Harnad S, Carr L. Earlier Web usage statistics as predictors of later citation impact. J Am Soc Inform Sci Technol 2006;57:1060-72.
14. Perneger TV. Relation between online 'hit counts' and subsequent citations: prospective study of research papers in the BMJ. BMJ 2004;329:546-7. [OpenAIRE]
15. Wren JD. URL decay in MEDLINE: a 4-year follow-up study. Bioinformatics 2008;24:1381-5.