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Pressley, Andrew. Elementary Differential Geometry. Vol Springer undergraduate mathematics series. 2nd ed. Springer; 2009. http://ezproxy.lib.le.ac.uk/login?url=http://lib.myilibrary.com?id=344762
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Montiel, Sebastián, Ros, Antonio, Babbitt, Donald G. Curves and Surfaces. Vol Graduate studies in mathematics. 2nd ed. American Mathematical Society; 2009. https://www.vlebooks.com/vleweb/product/openreader?id=LeicesterU&isbn=9781470411510
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Toponogov, Victor A., Rovenski, Vladimir Y. Differential Geometry of Curves and Surfaces: A Concise Guide. Birkhäuser Boston; 2006. http://ezproxy.lib.le.ac.uk/login?url=http://dx.doi.org/10.1007/b137116
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Toponogov, Victor Andreevich. Differential Geometry of Curves and Surfaces: A Concise Guide. Birkhäuser; 2005. http://ezproxy.lib.le.ac.uk/login?url=http://site.ebrary.com/lib/leicester/detail.action?docID=10228708
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Schwarz HA. Gesammelte Mathematische Abhandlungen: Erster Band. Forgotten Books; 2018.