69th American Helicopter Society International annual forum 2013 : Phoenix, Arizona, USA : 21-23 May 2013 : AHS International 69th annual forum & technology display : AHS International forum 69 : May 2013, Phoenix, AZ.
Papers."Vertical Flight Technical Society."Described as "Presented at the American Helicopter Society 69th Annual Forum, Phoenix, AZ, May 21-24, 2013....