Nádeník, Zbyněk Über das vierte Hilbertsche Problem. (The fourth Hilbert problem). (Czech) Zbl 0228.50001 Pokroky Mat. Fyz. Astron. 17, 16-23 (1972). Page: −5 −4 −3 −2 −1 ±0 +1 +2 +3 +4 +5 Show Scanned Page MSC: 51K10 Synthetic differential geometry PDFBibTeX XMLCite \textit{Z. Nádeník}, Pokroky Mat. Fyz. Astron. 17, 16--23 (1972; Zbl 0228.50001)