Approximation by exponential sums revisited

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A literature survey of low‐rank tensor approximation techniques (2013, neutral): “For this purpose, various approaches have been discussed in [27–29, 36, 37].”
Fast evaluation of the Caputo fractional derivative and its applications to fractional diffusion equations (2015, unknown): “Eﬃcient sum-of-exponentials approximation for the power function t − β ( β > 0 ) has been studied in detail both anaytically and algorithmically in a sequence of papers [5, 6, 7].”
Parameter estimation for nonincreasing exponential sums by Prony-like methods (2013, background): “4 Exponential sums are very often studied in nonlinear approximation, see also [5, 6].”