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| | References for Beltrami (Site not responding. Last check: 2007-09-19) |
 | | F Palladino and R Tazzioli, Letters of Eugenio Beltrami to Ernesto Cesàro, Archive for History of Exact Science 49 (4) (1996), 321-353. |
 | | M J Scanlan, Beltrami's model and the independence of the parallel postulate, Hist. |
 | | E Valabrega Gibellato, The papers of Eugenio Beltrami, Corrado Segre and Giovanni Vailati on the "forgotten Saccheri" (Italian), Pietro Riccardi (1828-1898) and the historiography of mathematics in Italy, Modena, 1987 (Modena, 1989), 297-303. |
| www-history.mcs.st-and.ac.uk /~history/Printref/Beltrami.html (183 words) |
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