The paper
Ueber die Fortpflanzung ebener Luftwellen von endlicher Schwingungsweiteby Bernhard Riemann, first published in Abhandlungen der Königlichen Gesellschaft der Wissenschaften zu Göttingen, vol. 8, 1860, is available here in the following formats:
A notice relating to this paper, published in Göttinger Nachrichten, 1859, Nr. 19, is also available in the following formats:
Links:
D.R. Wilkins