%0 Journal Article %A Benedikt, Jiří %T Estimates of the principal eigenvalue of the $p$-Laplacian and the $p$-biharmonic operator %J Mathematica Bohemica %D 2015 %P 215-222 %V 140 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.21136/MB.2015.144327/ %R 10.21136/MB.2015.144327 %G en %F 10_21136_MB_2015_144327