%0 Journal Article %A T. Figiel %A T. Iwaniec %A A. Pełczyński %T Computing norms and critical exponents of some operators in $L^{p}$-spaces %J Studia Mathematica %D 1984 %P 227-274 %V 79 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/sm-79-3-227-274/ %R 10.4064/sm-79-3-227-274 %G en %F 10_4064_sm_79_3_227_274