Systema polare coordinatarum (Latin Wikipedia)

Analysis of information sources in references of the Wikipedia article "Systema polare coordinatarum" in Latin language version.

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Carolus Guilelmus Burghardt, De legibus caloris in terris polaribus et de isothermarum situ (Halae, 1842), p. 16.
David Bierens de Haan, Dissertatio mathematica inauguralis, De lemniscata Bernouillana (Amstelodami: 1847), p. 14.