1. The iterated Kalman smoother as a Gauss-Newton method;Bell;SIAM J. Optimization,1994
2. Bendat, J., Piersol, A., 1986. Random Data: Analysis and Measurement Procedures, 2nd ed. Wiley, New York.
3. Bozic, S., 1984. Digital and Kalman Filtering. Edward Arnold Press.
4. Travel time estimation using cross correlation techniques;Dailey;Transpn. Res. B,1992
5. Freeway operations and the cusp catastrophe: an empirical analysis;Dillon;Transpn. Res. Rec.,1987