%0 Journal Article %A Paweł Głowacki %T Composition and $L^2$-boundedness of flag kernels %J Colloquium Mathematicum %D 2010 %P 581-585 %V 118 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/cm118-2-13/ %R 10.4064/cm118-2-13 %G en %F 10_4064_cm118_2_13