MathSciNet bibliographic data MR450901 (56 #9192) 44A25 (42A40) Nagel, Alexander; Wainger, Stephen \$L\sp{2}\$$L\sp{2}$ boundedness of Hilbert transforms along surfaces and convolution operators homogeneous with respect to a multiple parameter group. Amer. J. Math. 99 (1977), no. 4, 761–785. Article

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