1112/jlms/s1-20.3.180. See also: Van der Pol oscillator Smale, Stephen. Morse inequalities for a dynamical system. Bulletin of the American Mathematical Society
A Life 乔治娜·费里 Georgina Ferry 王艳红、杜磊 2010 哲人石丛书·第二辑 突破维数障碍——斯梅尔传 Steven Smale: The Mathematician Who Broke the Dimension Barrier 史蒂夫·巴特森 Steve Batterson