8Sivaneswaran N. Kramer S L, Mabhoney J P. Advanced Backcalculation Using a Nonlinear Least Squares Optimi- zation Technique [J]. Transportation Research Record 1239, TRB. National Research Council Washington, D. C,1991:93-102.
9Scullion T, U zan J, Paredes M. MODULS:A Micro-Computer-Based Backcalculation System [J]. Transportation Research Record 1260, TRB, National Research Council, Washington, D. C, 1990:180-181.
10Meier R W,Alexander D R,Freeman R B. Using Artificial Neural Networks as a Forward Approach to Backcalculation[J]. Transportation Research Record 1570, TRB, National Research Council, Washington. D. C, 1997 : 126-133.
