1. Cecil, T.E., Ryan, P.J.: Tight and Taut Immersions of Manifolds. Pitman (Advanced Publishing Program), Boston, (1985)
2. Choe J. (2003) Relative isoperimetric inequality for domains outside a convex set. Arch. Inequa. Appl. 1, 241-250
3. Choe J., Ghomi M., Ritoré M. (2006) Total positive curvature of hypersurfaces with convex boundary. J. Diff. Geom. 72, 129–147
4. Choe, J., Ritoré, M.: The relative isoperimetric inequality in Cartan-Hadamard 3-manifolds. J. Reine. Angew. Math. (in press)
5. Federer H. (1969) Geometric Measure Theory. Die Grundlehren der Mathematischen Wissenschaften, Band 153. Springer, Heidelberg