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G. A. Heuer, Functions Continuous at the Irrationals and Discontinuous at the Rationals, The American Mathematical Monthly, Vol. 72, No. 4 (Apr., 1965), pp. 370-373 ...
Ja-Yong Koo, Spline Estimation of Discontinuous Regression Functions, Journal of Computational and Graphical Statistics, Vol. 6, No. 3 (Sep., 1997), pp. 266-284 ...