1. Matrixmodelle zur Ermittlung von Teilströmen aus Querschnittsmessungen;Beil,1979
2. The accuracy of gravity model parameter estimates;Bell,1981
3. The estimation of an origin-destination matrix from traffic counts;Bell;Transpn Sci.,1983
4. The estimation of origin-destination flows and their confidence intervals from measurements of link volumes: a computer program;Bell;Traf. Engng Control,1983
5. The estimation of junction turning volumes from traffic counts;Bell;Traf. Engng Control,1984