Estimation of Transit Origin-Destination Matrices from Passenger Counts Using a Frequency-Based Approach. - William H. K. Lam; Z. X. Wu; K. S. Chan (J. Math. Model. Algorithms, 2003)

Transit passenger origin-destination estimation in congested transit networks with elastic line frequencies. - Z. X. Wu; William H. K. Lam (Ann. Oper. Res., 2006)