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  Classical Mechanics: Transformations, Flows, Integrable and Chaotic Dynamics - Joseph L. McCauley - Google Books

  http://books.google.de/books?id=PxytO6eByI8C&pg=PA60&lpg=PA60&dq=%22covariance+is+not+a+physical+principle%22&source=bl&ots=MU0I

  An advanced text for first-year graduate students in physics and engineering taking a standard classical mechanics course, this is the first book to describe the subject in the context of the language and methods of modern nonlinear dynamics. The…

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  Poncelet Porisms and Beyond: Integrable Billiards, Hyperelliptic Jacobians ... - Vladimir Dragović, Milena Radnović - Google Books

  http://books.google.de/books?id=LHeKF_Nj2EIC&pg=PA21

  The goal of the book is to present, in a complete and comprehensive way, a few areas of mathematics interlacing around the Poncelet porism: dynamics of integrable billiards, algebraic geometry of hyperelliptic Jacobians, and classical projective geometry…

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