The algorithms used by these functions are described in the following papers,

- T. Fessler, W.F. Ford, D.A. Smith, HURRY: An acceleration algorithm for scalar sequences and series ACM Transactions on Mathematical Software, 9(3):346--354, 1983. and Algorithm 602 9(3):355--357, 1983.

The theory of the @math{u}-transform was presented by Levin,

- D. Levin, Development of Non-Linear Transformations for Improving Convergence of Sequences, Intern. J. Computer Math. B3:371--388, 1973

A review paper on the Levin Transform is available online,

- Herbert H. H. Homeier, Scalar Levin-Type Sequence Transformations, @url{http://xxx.lanl.gov/abs/math/0005209}

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