John Reyn, “Phase Portraits of Planar Quadratic Systems ” Springer; 1 edition (April 2, 2007) | ISBN: 0387304134 | 340 pages | Djvu | 1,4 Mb Although some examples of phase portraits of quadratic systems can already be found in the work of Poincaré, the first paper dealing exclusively with these systems was published by Büchel in 1904. By the end of the 20th century an increasing flow of publications resulted in nearly a thousand papers on the subject.

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Physics For Entertainment CreateSpace | February 12, 2010 | ISBN-10: 1450587313 | 216 pages | PDF | English | 9MB Published in 1913, a best-seller in the 1930s and long out of print, Physics for Entertainment was translated from Russian into many languages and influenced science students around the world. Among them was Grigori Yakovlevich Perelman, the Russian mathematician (unrelated to the author), who solved the Poincaré conjecture, and who was awarded and rejected the Fields Medal.

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Quantum Spaces: Poincaré Seminar 2007 By Bertrand Duplantier, Vincent Rivasseau Publisher: Birkhäuser Basel 2007 | 227 Pages | ISBN: 3764385219 | PDF | 2 MB

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