Geodesic
Interpolation and Curve Fitting by Sectionally Linear Functions
Canadian mathematical bulletin, Tome 3 (1960) no. 1, pp. 41-57

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Functions employed for interpolation and curve fitting are for the most part polynomials with numerical coefficients. Indeed these are functions whose values for numerically given arguments can be computed directly without resorting to non-algebraic designs. It is known, however, that there are cases where polynomial interpolation does not yield an adequate approximation to a given function (cf. [4], p. 34). 
Schwerdtfeger, Hans. Interpolation and Curve Fitting by Sectionally Linear Functions. Canadian mathematical bulletin, Tome 3 (1960) no. 1, pp. 41-57. doi: 10.4153/CMB-1960-009-4
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     title = {Interpolation and {Curve} {Fitting} by {Sectionally} {Linear} {Functions}},
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     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-1960-009-4/}
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