1. Isoperimetric Inequalities and Applications;Bandle,1980
2. Isopevimetrio inequalities;Bandle,1983
3. The first Dirichlet eigenvalue and radius of a geodesic ball;Bang;Proc. Amer. Math. Soc.,1988
4. Existence Theorems in Partial Differential Equations;Bernstein,1950
5. Bounds for the ratios of the first three membrane eigenvalues;Brands;Arch. Rational Mech. Anal.,1964