1. Optimal Performance of Ships Under Combined Power and Sail;Letcher;Journal of Ship Research,1982
2. Linearized Analysis of Sailing and Motor Sailing Vessels;Satchwell,1983
3. Wind as an Aid for Ship Propulsion;Schenzle,1983
4. Revival of the Flettner Rotor;Williams;Trans. SNAME,1983
5. Windnutzung für den Schiffsantrieb;Wagner,1984