1. Riemann, B. Versuch einer allgemeinen auffassung der integration und differentiation. Gesammelte Werke 62, 1876 (1876).
2. Liouville, J. Memoir on some questions of geometry and mechanics, and on a new kind of calculation to solve these questions. J. de l’E’cole Pol. Tech 13, 1–69 (1832).
3. Abel, N. Solution de quelques probl`emes `a l’aide d’int´egrales d´efinies. Oeuvres 1, 11–27 (1881).
4. Euler, L. On transcendental progressions that is, those whose general terms cannot be given algebraically. Commentarii academiae scientiarum Petropolitanae 1738(5), 36–57 (1999).
5. Laurent, H. Sur le calcul des derivees `a indices quelconques. Nouvelles annales de math´ematiques: journal des candidats aux ´ecoles polytechnique et normale 3, 240–252 (1884).