1. Ambrosio, L., Buttazzo, G.: An optimal design problem with perimeter penalization. Calc. Var. 1, 55-69 (1993)
2. Bucur, D., Zolésio, J.-P.: Boundary optimization under pseudo curvature constraint. Ann. Scuola Norm. Sup. Pisa (4) 23, 681-699 (1996)
3. Buser, P.: A note on the isoperimetric constant. Ann. Sci. École Norm. Sup. (4) 15, 213-230 (1982)
4. Cazacu, O., Cristescu, N.: Constitutive model and analysis of creep flow of natural slopes. Italian Geotechnical Journal 34, 44-54 (2000)
5. Cheeger, J.: A lower bound for the smallest eigenvalue of the Laplacian. In: Gunning, R.C. (ed.) Problems in Analysis, A Symposium in Honor of Salomon Bochner, pp. 195-199. Princeton Univ. Press 1970