Blaschke, Wilhelm Integralgeometrie. XII. Über vollkommene optische Instrumente. (German) Zbl 0014.11903 Abh. Math. Semin. Hamb. Univ. 11, 409-412 (1936). Page: −5 −4 −3 −2 −1 ±0 +1 +2 +3 +4 +5 Show Scanned Page Cited in 1 Document Keywords:Variational calculus PDFBibTeX XMLCite \textit{W. Blaschke}, Abh. Math. Semin. Univ. Hamb. 11, 409--412 (1936; Zbl 0014.11903) Full Text: DOI