O'Neill, B. (2006). Elementary Differential Geometry (2a. ed.). Elsevier.
Lua i Stíl Chicago (17ú heag.)O'Neill, Barrett. Elementary Differential Geometry. 2a. ed. Amsterdam: Elsevier, 2006.
Lua MLA (9ú heag.)O'Neill, Barrett. Elementary Differential Geometry. 2a. ed. Elsevier, 2006.
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