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We calculate the multipoint Green functions in 1+1 dimensional integrablequantum field theories. We use the crossing formula for general models andcalculate the 3 and 4 point functions taking in to account only the lowernontrivial intermediate states contributions. Then we apply the general resultsto the examples of the scaling $Z_{2}$ Ising model, sinh-Gordon model and$Z_{3}$ scaling Ising model. We demonstrate this calculations explicitly. Theresults can be applied to physical phenomena as for example to the Ramanscattering.

Multipoint Green's functions in 1+1 dimensional integrable quantum field theories