%0 Journal Article %A Gianfranco Marletta %A Fulvio Ricci %A Jacek Zienkiewicz %T Two-parameter maximal functions associated with degenerate homogeneous surfaces in ℝ³ %J Studia Mathematica %D 1998 %P 67-75 %V 130 %N 1 %U http://geodesic.mathdoc.fr/articles/10.4064/sm-130-1-67-75/ %R 10.4064/sm-130-1-67-75 %G en %F 10_4064_sm_130_1_67_75