Below is a list of most important databases for your subject area. Relevant databases for Mathematics are listed here
Academic Search Complete is a scholarly, multi-disciplinary full-text database. The database features PDF content dating back as far as 1887, with the majority of full text titles in searchable PDF format.
The ACM DL is a vast collection of citations and full text from ACM journal, newsletter articles and conference proceedings.
JSTOR provides a comprehensive digital archive of important scholarly journals. It offers multidisciplinary and discipline-specific collections that include complete runs of journals as well as select monographs, transactions, and conference proceedings.
The resource provides full text access to over 2,500 journals and over 190 UCC purchased books in all disciplines published by Elsevier Science.
Scopus is the largest abstract and citation database of peer-reviewed literature, scientific journals, books and conference proceedings. Across all research fields - science, mathematics, engineering, technology, health and medicine, social sciences, and arts and humanities — Scopus delivers the broadest overview of global, interdisciplinary scientific information.