1. Hefner,J.N.andBushnell, D.M. "An Overview ofConceptsfor AircraftDragReduction",AGARD Report No.654, Special Courseon Conceptsfor DragReduction,pp.1-30,1977.
2. Bushnell, D. M. "Overview of aircraft drag reduction technology," in Special course on skin friction drag reduction, AGARD Report 786,1992.