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References to 'limit cycle'
1. Bam\`on's theorem by Daume
2. Bautin's theorem by Daume
3. Dulac's theorem by Daume
4. Hilbert's 16th problem for quadratic vector fields by Daume
5. Hilbert's sixteenth problem by Daume
6. Hopf bifurcation theorem by Daume
7. van der Pol equation by Daume