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Tong, Howell, Xia, Y and Li, W.K (2007) Threshold variable selection using nonparametric methods. Statistica Sinica, 17 (1). pp. 265-288. ISSN 1017-0405
Li, W.K, Tong, Howell and Xia, Y (1999) On extended partially linear single-index models. Biometrika, 86 (4). pp. 831-842. ISSN 0006-3444