Recent observations of the cosmic microwave background anisotropy indicate that, at very small angular scales, the power of the CMB angular spectrum is smaller than that suggested by previous observations. Moreover, new recent simulations of the lensing effect conducted by us -at the same scales- give powers larger than those obtained in previous numerical estimates. In order to study the compatibility between our numerical predictions (lensing effect) and current observations, the coupling among Sunyaev-Zel'dovich, lensing and Rees-Sciama effects should be simulated.

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