On the existence of Bertrand pairs

• Author(s): Breda, A. M. d'Azevedo ; Carvalho, F. J. Craveiro de ; Wegner, Bernd
• Date: 2001
• Persistent ID: http://hdl.handle.net/10316/11464
• Origin: Estudo Geral - Universidade de Coimbra
• Document Type: Preprint
• Language: English