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''Quantile Fourier transform, quantile\nseries, and nonparametric estimation of quantile spectra,''\nCommunications in Statistics: Simulation and Computation, 1–22.\n [4] Li, T.-H. (2025).\n''Quantile-crossing spectrum and spline autoregression\nestimation,'' Statistical Inference for Stochastic Processes,\n28, 20. [5] Li, T.-H. (2025).\n''Spline autoregression method for estimation of quantile\nspectrum,'' J. of Computational and Graphical Statistics, 1-15.\n [6] Li, T.-H., and Megiddo,\nN. (2026). ''Spline quantile regression,'' J. of Statistical\nTheory and Practice, 20, 30. \n[7] Li, T.-H. (2026). 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