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In the weak coupling BCS-approximation normal impurities do not influencesuperconducting T_{c} in significant manner in case of isotropic s-wavepairing. However, in case of d-wave pairing these are strongly pair-breaking.This fact is in rather strong contradiction with many experiments on disorderedhigh-T_{c} superconductors assuming the d-wave nature of pairing in thesesystems. With the growth of electron attraction within the Cooper pair thesystem smoothly crosses over from BCS-pairs to compact Boson picture ofsuperconductivity. As pairing strength grows and pairs become compactsignificant deviations from universal Abrikosov-Gorkov dependence of T_{c} ondisorder appear in case of d-wave pairing with superconducting state becomingmore stable than in the weak coupling case. As high-T_{c} superconductors areactually in the intermediate region with Cooper pairs size of the order of fewinteratomic lengths, these results can explain the relative stability of d-wavepairing under rather strong disordering.Comment: 8 pages, 3 figures, RevTeX 3.0, 1 Postscript figure attached,  submitted to JETP Letter

Disordering effects in superconductors with anisotropic pairing: From Cooper pairs to compact bosons