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References to 'hypersurface'
1. Baouendi-Treves approximation theorem by jirka
2. gradient by CWoo
3. Lagrange multipliers on manifolds by stevecheng
4. level sets of smooth functions on manifolds by rspuzio
5. Levi flat by jirka
6. Lewy extension theorem by jirka
7. Lewy hypersurface by jirka
8. metric superfields by bci1
9. Nevanlinna theory by Simone
10. submanifold by jirka
11. superfields, superspace and supergravity by bci1