1. Ait-Saïdi, A., Ferraty, F., Kassa, R. and Vieu, P.: Cross-validated estimations in the single functional index model ( to appear) (2008).
2. Azzalini, A., Bowman, A.: On the use of Nonparametric Regression for Checking Linear Relationships. J.R. Statist. Soc. B. 55,2 549-557 (1993).
3. Bosq, D.: Linear Processes in Function Spaces: Theory and Applications. Lecture Notes in Statistics 149 Springer-Verlag, New York. (2000).
4. Cardot, H., Ferraty, F.,Mas, A. and Sarda, P.: Testing Hypothesys in the Functional Linear Model. Scandinavian Journal of Statistics. 30 241-255 (2003).
5. Cardot, H., Ferraty, F. and Sarda, P.: Spline Estimators for the Functional Linear Model. Statistica Sinica. 13 (3) 571-591 (2003).