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References to 'reversal'
1. category of paths on a graph by rspuzio
2. closure properties on languages by CWoo
3. colorings of plane graphs by marijke
4. context-free language by CWoo
5. context-sensitive language by CWoo
6. Coxeter group by Simone
7. definite language by CWoo
8. homomorphism of languages by CWoo
9. quandles by StevieHair
10. quotient of languages by CWoo
11. regular language by mps
12. sign relation by Jon Awbrey
13. theory of formal languages by rspuzio