GRATTAN-GUINNESS, I., ed. Landmark writings in Western mathematics 1640-1940. 2005. Obrds. -- H. WEBER. Die partiellen Differential-Gleichungen der mathematischen Physik. Nach Riemann's Vorlesungen bearb. 6. Aufl. 1919. 2 vols. Ohcl. (1 spine faded). -- H.F. COHEN. How modern science came into the world. Four civilizations, one 17-th c. breakthrough. (2010). Obrds. -- And 1 o. (5).