1Hyman.G.M.The calibration of trip distribution models.Environ-ment and Planning,1969.1(3).
2Van.N.J.der Z-jpp.Heydecker.B.G.Improved algorithms for cali-brating gravity models.Transportation Networks:Recent MethodologicalAdvances.M.Belled,1998.
3Goncalves.M.B.Souza.J.E.Parameter estimation in a trip distribu-tion model by random perturbation of a descent method.TransportationResearch Part B,2001.
