Figure 3From: OReFiL: an online resource finder for life sciencesGrowth of online resources and MEDLINE. The numbers of URLs appeared in MEDLINE abstracts. The number of the DNS-resolvable URLs is that of URLs whose server name can be resolvable. The number of the page-accessible URLs is that of URLs whose page can be accessed (the server returns the HTTP status code of 200). MEDLINE growth is added for reference.Back to article page