NARCIS, national research database (use search term: Frisian)
Dissertations & Theses 2.3 million theses (international)
Frisian doctoral theses may be available through Tresoar's online catalogue. Online dissertations and other research publications in full text or datasets may be searched through the National Academic Research and Collaborations Information System NARCIS (search term e.g.: Frisian).
Theses that aren't available at Oxford may be requested through Interlibrary Loan.
