MathSciNet bibliographic data MR958838 (89j:35096) 35P10 (35S05 47G05 58G25) Christ, F. M.; Sogge, C. D. The weak type \$L\sp 1\$$L\sp 1$ convergence of eigenfunction expansions for pseudodifferential operators. Invent. Math. 94 (1988), no. 2, 421–453. Article

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