 Mémoire sur les intégrales définies, prises entre des limites imaginaires by Augustin-Louis Cauchy

Original edition, 68 pages. Cited for the definition of complex integration, path variation and singular points. Original OCR: www.e-rara.ch/zut/download/ftpack/plain/8504602 . Accessible later reprint: 1874 reprint, pp. 265–304, especially §§1–6. The reprint date is distinct from the memoir's date.

Online source: www.e-rara.ch/zut/content/titleinfo/8504602