References

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Schuster, E. F. (1985). “Incorporating support constraints into nonparametric estimators of densities.” Communications in Statistics - Theory and Methods, 14(5), 1123-1136. https://doi.org/10.1080/03610928508828965

Schraudolph, N. N. (1999). “A fast, compact approximation of the exponential function.” Neural Computation, 11(4), 853-862. https://doi.org/10.1162/089976699300016467