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References to 'free product'
1. $PSL_2(\mathbb{Z})$ is a free product by rm50
2. counterexamples for products and coproduct by Algeboy
3. free product with amalgamated subgroup by mathcam
4. free products and group actions by rm50
5. generalized dihedral group by yark
6. graph product of groups by mps
7. HNN extension by juanman
8. Scott-Wiegold conjecture by whm22
9. Van Kampen's theorem by RonaldBrown