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Huyghens :footcite:`1657:huygens` wrote one of the first books on
probability theory.

Mix with a footnote [#note]_.

Another few citations: :footcite:`rockafellar:1970,1972:savage`.

Cite it twice: :footcite:`1657:huygens`.

.. [#note] A footnote.

.. footbibliography::
