Theses (Masters, BSc) and dissertations (PhD) are essential sources of information. Different search engines and databases provide both unique and overlapping coverage of theses that are increasingly provided in full-text format. Don't forget to use WorldCat!!
MathSciNet now contains bibliographic data and direct links for Ph.D. theses published in Mathematics, Applied Mathematics and Statistics sections from the ProQuest Dissertations and Theses Global database.