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Randwertaufgaben bei Systemen von Linearen Partiellen Differentialgleichungen erster Ordnung by Hurwitz, Wallie Abraham (1910). available in print
Recherche méthodique et propriétés des triangles rectangles en nombres entiers by Bahier, Eugène (1916). available in print
Recherches sur la géométrie de direction; méthodes de transformation; anticaustiques by Laguerre, Edmond Nicolas (1885). available in print
Recherches sur les substitutions, et en particulier sur les groupes transitifs by Maillet, Edmond Théodore (1892). available in print
Recreations in Science and Natural Philosophy by Ozanam, Jacques (1844). available in print
Réduction des intégrales définies générales. ∫^∞₀ F(x) Cos.pxdx/q²+x², ∫^∞₀ F(x) Sin.pxdx/q²+x², et application de ces formules au cas, que F(x) a un facteur de la forme Sin.^ax ou Cos.^ax. by Haan, D. Bierens (1857). available in print
Repertorio di matematiche superiori (definizioni--formole--teoremi--cenni bibliografici) (Volume 1) by Pascal, Ernesto (1898). available in print
Repertorio di matematiche superiori (definizioni--formole--teoremi--cenni bibliografici) (Volume 2) by Pascal, Ernesto (1898). available in print
Researches on curves of the second order, also on cones and spherical conics treated analytically, in which the tangencies of Apollonius are investigated, and general geometrical constructions deduced from analysis; also several of the geometrical conclusions of M. Charles are analytically resolved, together with many properties entirely original by Hearn, George Whitehead (1846). available in print