Cartan, Elie: The Wikipedia Link. See also, Cartan, Elie(author), "Leçons sur les invariants intégraux", Paris A. Hermann, 1922. Link [Internet Archive, free access]
Darboux, Jean Gaston: The Wikipedia Link. See alsoDarboux, Gaston(author),"Leçons sur les systèmes orthogonaux et les coordonnées curvilignes", Paris Gauthier-Villars, 1910. Link[Internet Archive, free access]
Jacobi, Carl Gustav Jacob: The WikipediaLink.See also Jacobi, Carl Gustav Jacob (author), "C. G. J. Jacobi’s Collected Works" (consists of eight volumes, 4012 pages), AMS, 1969.Link. See also the book by L Koenigsberger (author), "Carl Gustav Jacob Jacobi": Festschrift zur Feier der Hundertsten Wiederkehr Seines Geburtstages, B. G. Teubner, 1904. Link [Internet Archive, free access]
Korteweg, Diederik: The Wikipedia Link.See also the article Korteweg, DJ and De Vries, G, "On the change of form of long waves advancing in a rectangular canal, and on a new type of long stationary waves", Philosophical Magazine, 39 (240) (1895) 422–443, doi.org/10.1080/14786449508620739. Link
Kovalevskaya, Sofya: The Wikipedia Link. See also Kowalevski, Sophie(author), "Sur le probleme de la rotation d'un corps solide autour d'un point fixe", Acta Math. 12 177 - 232, 1889, doi.org/10.1007/BF02592182. Link [Project Euclid, open access]
Leibniz, Gottfried Wilhelm: "Leibniz - Edition: Die Akademie-Ausgabe, Collected papers of Gottfried Wilhelm Leibniz". Leibniz-Archiv/Leibniz-Forschungsstelle Hannover,Link
Lie, Sophus: The Wikipedia Link. See also the Collected Works of Sophus Lie, Based on a grant from the Norwegian Research Fund of 1919 with the support of the Videnskapsakademi in Oslo and the Academy of Sciences in Leipzig. Leipzig : B. G. Teubner, 1922-1960. Link [Internet Archive, free access]
Noether, Emmy: The Wikipedia Link. See also the book by Y Kosmann-Schwarzbach (author); translated by BE Schwarzbach, "The Noether Theorems": Invariance and Conservation Laws in the Twentieth Century, Springer, 2011. Link
Painlevé, Paul: The Wikipedia Link. See also Painlevé, Paul(author), "Lectures on the Analytical Theory of Differential Equations", given in Stockholm (September, October, November 1895) at the invitation of His Majesty the King of Sweden and Norway, Paris A. Hermann, 1897. Link [Internet Archive, free access]