<bdi><a href="https://en.wikipedia.org/wiki/en:Henri_Pirenne" class="extiw" title="w:en:Henri Pirenne"><span title="Belgian historian (1862-1935)">Henri Pirenne</span></a>
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<a rel="nofollow" class="external free" href="https://archive.org/details/histoiredebelgiq07pireuoft">https://archive.org/details/histoiredebelgiq07pireuoft</a>