Web of science
"... accesses multidisciplinary databases of bibliographic information gathered from thousands of scholarly journals. The databases are indexed so you
can search for specific articles by subject, author, journal, and/or author address. Because the information stored about each article includes the article's cited reference list (often called its bibliography), you can also search the databases for articles that cite a known author or work."--Tutorial screen.
More about Web of Science
Mathematics Encyclopedia (Wolfram MathWorld)
MathWorld is a comprehensive and interactive mathematics encyclopedia for students, educators, math enthusiasts, and researchers. which is continuously
updated to include new material and incorporate new discoveries.
Encyclopedia of statistical sciences
Reference tool covering statistics, probability theory, biostatistics, quality control, and economics with emphasis in applications of statistical methods
in sociology, engineering, computer science, biomedicine, psychology, survey methodology, and other client disciplines. Includes the full text of the second print edition, the entire original edition, plus supplements and updates all rolled into one fully searchable site.