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Pressley, Andrew. Elementary differential geometry [Internet]. 2nd ed. New York: Springer; 2009. Available from: 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 [Internet]. 2nd ed. Providence, R.I.: American Mathematical Society; 2009. Available from: https://www.vlebooks.com/vleweb/product/openreader?id=LeicesterU&isbn=9781470411510
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Toponogov, Victor Andreevich. Differential geometry of curves and surfaces: a concise guide [Internet]. Boston, Mass: Birkhäuser; 2005. Available from: http://ezproxy.lib.le.ac.uk/login?url=http://site.ebrary.com/lib/leicester/detail.action?docID=10228708
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