Comparison of top 5 search results, example queries. Comparison of top 5 search results for the search query "(BMP) AND (tooth OR teeth) NOT (hair OR beak)" (A-F) and for the search query "dinosaur feather" (G-J) based on their relevancy between PubFocus, Google™ Scholar and Scirus™ services. For each record title, authors, publication source and publication year are listed. Identical records between columns have the same colour coding. Records presented in white-on-black mode were subjectively estimated to have either low relevancy to the original search query or to originate from the source with arguable scientific credibility. A, G) Top 5 PubFocus results based on Publication Impact Factor with Google™ Scholar used as the source of forward citations. B, H) Top 5 PubFocus results based on Google™ Scholar forward citations only. C) Top 5 PubFocus results based on Publication Impact Factor with PubMed Central used as the source of forward citations. D) Top 5 PubFocus results based on PubMed Central forward citations only. E, I) Top 5 Google™ Scholar results. F, J) Top 5 Scirus™ results.