Two-parameter maximal functions associated with homogeneous surfaces in ℝ n Gianfranco Marletta; Fulvio Ricci — 1998 Studia Mathematica
Two-parameter maximal functions associated with degenerate homogeneous surfaces in ℝ³ Gianfranco Marletta; Fulvio Ricci; Jacek Zienkiewicz — 1998 Studia Mathematica