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Snellius, Willebrordus, 1581-1626. -- Willebrordi SneIII ... Doctrine triangulorum canonice libri ».. MDCXXVII. [1627] (Card 3)
Dict. scientific biog., Zils pO. 501.
Bierens de Haan, D. Bib. neerlandaise, 4399. BN, v. 174, column 492. 1. Trigonometry-~-Early works to 2. Mathematics--Early works to - Hortensius, Martinus, 1605- I. Snellius, Willebrodus,
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