Book Gray, Jeremy; (1999)
The symbolic universe: Geometry and physics, 1890-1930

Chapter Giulia Giannini; (2009)
Poincaré, la nozione di gruppo e il Programma di Erlangen di F. Klein

Article Darrigol, Olivier; (2015)
The Mystery of Riemann's Curvature

Book Alberto Cogliati; (2024)
La geometria non euclidea. Una breve storia dall’antichità a Poincaré

Article Nurzia, Laura; (1979)
Relazioni tra le concezioni geometriche di Federigo Enriques e la matematica intuizionista tedesca

Article Maria de Paz; José Ferreirós; (2020)
From Gauss to Riemann Through Jacobi: Interactions Between the Epistemologies of Geometry and Mechanics?

Chapter Bottazzini, Umberto; (1994)
Geometry and “metaphysics of space” in Gauss and Riemann

Book Torretti, Roberto; (1978)
Philosophy of geometry from Riemann to Poincaré

Article Peckhaus, Volker; (2014)
Ernst Schröder on pasigraphy

Article Plotnitsky, Arkady; (2009)
Bernhard Riemann's Conceptual Mathematics and the Idea of Space

Article Tazzioli, Rossana; (1994)
Il teorema di rappresentazione di Riemann: Critica e interpretazione di Schwarz

Book Gauß, Carl Friedrich; Reich, Karin; (2012)
Wolfgang Sartorius von Waltershausen, Gauß zum Gedächtniss: Biographie Carl Friedrich Gauß, Leipzig 1856. Mit dem von Karin Reich verfassten Essay “Wolfgang Sartorius von Waltershausen (1809--1876)”

Book Féry, Suzanne; (2012)
Aventures de l'analyse de Fermat à Borel: Mélanges en l'honneur de Christian Gilain

Article Muntersbjorn, Madeline; (2012)
On the Intellectual Heritage of Henri Poincaré

Article Le, François; (2015)
“Geometrical equations”: Forgotten premises of Felix Klein's Erlanger Programm

Article Siqueira, Rogério Monteiro da; (2015)
Editing Geometries: The Geometry Volumes in Klein's Encyclopedia

Article Glas, Eduard; (2000)
Model-based reasoning and mathematical discovery: The Case of Felix Klein

Article Deng, Ming-li; Zhang, Hong-mei; (2008)
The Historical Origins of the Unification of Geometries by Means of Group Theory

Article Deng, Mingli; Yan, Chenguang; (2006)
The Rudiments of the Idea of Riemann for Geometry

Article Knobloch, Eberhard; (2002)
Leibniz's Rigorous Foundation of Infinitesimal Geometry by Means of Riemannian Sums