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References to 'annulus'
1. calculating the solid angle of disc by pahio
2. coefficients of Laurent series by pahio
3. Dulac's criteria by Daume
4. Hadamard three-circle theorem by bbukh
5. Laurent series by djao
6. proof of Hadamard three-circle theorem by Simone
7. regular at infinity by pahio
8. topic entry on complex analysis by pahio
9. using residue theorem near branch point by pahio
10. when all singularities are poles by pahio