1. also Mitteilung 72-06 der Deutsche Gesellschaft für Luft- und Raumfahrt, Köln, Germany.
2. Windtunnel tests to determine the instationary aerodynamic derivatives on a model of a twinbridge;van Nunen,1971
3. Wind tunnel tests of the aeroelastic stability of the Heer-Agimont bridge;Olivari,1975
4. A comparison between full-scale wind-induced instability of the Wye bridge and that predicted from sectional-model tests;Walshe,1970