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<h2 id="references">References</h2> <ol> <li id="fn:1"><p>Halbertsma, Herrius (1982). "Summary". Frieslands Oudheid (PDF) (English summary) (in Dutch). Groningen: Rijksuniversiteit Groningen. pp. 791–798. OCLC 746889526. <a href="https://www.rug.nl/research/portal/files/14479568/Halbertsma.PDF" target="_blank">https://www.rug.nl/research/portal/files/14479568/Halbertsma.PDF</a> <a href="#fnref:1" class="footnote-back-ref">↩</a></p></li> <li id="fn:2"><p>Halbertsma, Herrius (1982). "Summary". Frieslands Oudheid (PDF) (English summary) (in Dutch). Groningen: Rijksuniversiteit Groningen. pp. 791–798. OCLC 746889526. <a href="https://www.rug.nl/research/portal/files/14479568/Halbertsma.PDF" target="_blank">https://www.rug.nl/research/portal/files/14479568/Halbertsma.PDF</a> <a href="#fnref:2" class="footnote-back-ref">↩</a></p></li> </ol>