• De integratione aequationis differentialis $\dfrac{m\,dx}{\sqrt{1-x^{4}}} = \dfrac{n\,dy}{\sqrt{1-y^{4}}}$

  On the integration of the differential equation $\dfrac{m\,dx}{\sqrt{1-x^{4}}} = \dfrac{n\,dy}{\sqrt{1-y^{4}}}$
  Leonhard Euler · 1761 Novi Commentarii Academiae Scientiarum Imperialis Petropolitanae, vol. 6, pp. 37–57 ai-draft → EN

• Metodo per misurare la lemniscata, Schediasma I

  Method for Measuring the Lemniscate, First Sketch
  Giulio Carlo de' Toschi di Fagnano · 1718 Giornale de' letterati d'Italia, vol. 29, p. 258 skimmed → EN

• Metodo per misurare la lemniscata, Schediasma II

  Method for Measuring the Lemniscate, Second Sketch
  Giulio Carlo de' Toschi di Fagnano · 1718 Giornale de' letterati d'Italia, vol. 30, p. 87 skimmed → EN

• De linea isochrona, in qua grave sine acceleratione descendit, et de controversia cum Dn. Abbate De Conti

  On the Isochronous Curve, on which a Heavy Body Descends without Acceleration, and on the Controversy with the Abbé De Conti
  Gottfried Wilhelm Leibniz · 1689 Acta Eruditorum, April skimmed → EN

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