ScienceDirect is an information source for scientific, technical, and medical research. It is searched using the Scirus search engine. Scirus is one of the most comprehensive science-specific search engine available on the Internet. Driven by the latest search engine technology, it enables scientists, students and anyone searching for scientific information to chart and pinpoint data, locate university sites and find reports and articles quickly and easily. It was launched by Elsevier Science, an international publisher of scientific information.