Chapter Drago, Antonino; Romano, P. (1994)
Per una nuova concezione della non contraddittorietà di una teoria: Lobacevskij ha dimostrato la coerenza della geometria iperbolica?. In: Logica e filosofia della scienza: Problemi e prospettive: Atti del Congresso triennale della Società Italiana di Logica e Filosofia delle Scienze, Lucca, 7-10 gennaio 1993 (p. 145). (/isis/citation/CBB000045704/) unapi

Article Arboleda, Luis Carlos; Anacona, Maribel Patricia (1994)
Las geometrías no euclidianas en Colombia: La apuesta euclidiana del professor Julio Garavito (1865-1920). Quipu (pp. 7-24). (/isis/citation/CBB000067738/) unapi

Book Maracchia, Silvio (1993)
Dalla geometria euclidea alla geometria iperbolica: Il modello di Klein. (/isis/citation/CBB000061409/) unapi

Article Fili, Kristina (1992)
“Boobrazhaemaia” geometriia Lobacheskogo i Russkii avangard. (Lobachevskii's “imaginary” geometry and the Russian avant-garde). VIET: Voprosy Istorii Estestvoznaniia i Tekhniki (pp. 43-48). (/isis/citation/CBB000050964/) unapi

Article Izotov, G.E. (1992)
K istorii opublikovaniia N.I. Lobachevskii sochinenii po “boobrazhaemoi” geometrii. (On the publishing history of Lobachevskii's work on “imaginary” geometry). VIET: Voprosy Istorii Estestvoznaniia i Tekhniki (pp. 36-43). (/isis/citation/CBB000051064/) unapi

Article Reich, Karin (1992)
Levi-Civitasche Parallelverschiebung, affiner Zusammenhang, Übertragungsprinzip: 1916/17-1922/23. Archive for History of Exact Sciences (pp. 77-105). (/isis/citation/CBB000057414/) unapi

Article Schirn, Matthias (1991)
Kants Theorie der geometrischen Erkenntnis und die nichteuklidische Geometrie. Kant-Studien (pp. 1-28). (/isis/citation/CBB000036860/) unapi

Article Stump, David (1991)
Poincaré's thesis of the translatability of Euclidean and non-Euclidean geometries. Nous (pp. 639-657). (/isis/citation/CBB000052800/) unapi

Article Freudenthal, Hans (1991)
Nichteuklidische Geometrie im Altertum?. Archive for History of Exact Sciences (pp. 189-197). (/isis/citation/CBB000057540/) unapi

Article Chandrasekhar, T.R. (1989)
Non-Euclidean geometry from early times to Beltrami. Indian Journal of History of Science (pp. 249-256). (/isis/citation/CBB000064274/) unapi

Book Rosenfeld, B.A. (1988)
The history of non-Euclidean geometry: Evolution of the concept of a geometric space. Translated by Abe Shenitzer, with the editorial assistance of Hardy Grant. (/isis/citation/CBB000047435/) unapi

Chapter Gray, Jeremy (1987)
The discovery of non-Euclidean geometry. In: Studies in the history of mathematics (p. 37). (/isis/citation/CBB000042850/) unapi

Book Trudeau, Richard J. (1987)
The non-Euclidean revolution. With an introduction by H.S.M. Coxeter. (/isis/citation/CBB000060338/) unapi

Chapter Hawkins, Thomas (1987)
Non-Euclidean geometry and Weierstrassian mathematics: The background to Killing's work on Lie algebras. In: Studies in the history of mathematics (p. 21). (/isis/citation/CBB000042783/) unapi

Article Gómez, Ricardo J. (1986)
Beltrami's Kantian view of non-Euclidian geometry. Kant-Studien (pp. 102-107). (/isis/citation/CBB000064640/) unapi

Book Saccheri, Girolamo (1986)
Euclides vindicatus. Edited and translated by Halsted, George Bruce. Second edition. (/isis/citation/CBB000034008/) unapi

Book Pont, Jean-Claude (1986)
L'aventure des parallèles: Histoire de la géométrie non euclidienne: Précurseurs et attardés. (/isis/citation/CBB000029033/) unapi

Book Reichardt, Hans (1985)
Gauss und die Anfänge der nicht-euklidischen Geometrie. Mit Originalarbeiten von J. Bolyai, N.I. Lobatschewski und F. Klein. (/isis/citation/CBB000031390/) unapi

Article Menghini, Marta (1984)
Le geometrie non euclidee: Considerazioni storico-critiche. Cultura e Scuola (pp. 210-221). (/isis/citation/CBB000014539/) unapi

Chapter Hawkins, Thomas (1983)
Non-Euclidean geometry and Weierstrassian mathematics: The background to Killing's work on Lie algebras. In: History and philosophy of science: Selected papers (p. 73). (/isis/citation/CBB000011118/) unapi