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Such repeatability can be conveniently expressed with the help of almost periodicity. In particular, almost periodically correlated (APC) processes play an important role in the analysis of repeatable ...

Jie Shen, Li-Lian Wang, Analysis of a Spectral-Galerkin Approximation to the Helmholtz Equation in Exterior Domains, SIAM Journal on Numerical Analysis, Vol. 45, No. 5 (2007), pp. 1954-1978 ...