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The aim of this note is to prove endpoint boundedness of the generalized Radon transform which was introduced by Phong and Stein. M. Christ's combinatorial method is used to obtain restricted weak type at the endpoints. Also we show that the results of this note are essentially optimal.doi:10.1090/s0002-9939-01-05956-1 fatcat:ydtih6ujsnhkvdlfiuqqwkkbje