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1 Summary. Many complex systems are characterized by intriguing spatio-temporal structures. Their mathematical description relies on the analysis of appropriate correlation functions. Functional integral techniques provide a unifying formalism that facilitates the computation of such correlation functions and moments, and furthermore allows a systematic development of perturbation expansions and other useful approximative schemes. It is explained how nonlinear stochastic processes may be mappeddoi:10.1007/978-1-4614-1800-9_69 fatcat:2el2v3qrzzb7nlnyaa4vgxyo5y