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Submitted on: 08 April 2015.
Revised on: 27 May 2015.
Accepted on: 03 July 2015.
___________________AERONAUTICAL JOURNAL---CAMBRIDGE UNIV PRESS
Submitted on: 11 May 1999.
Revised on: 02 August 1999.
Accepted on: 20 August 1999.
___________________AERONAUTICAL JOURNAL---CAMBRIDGE UNIV PRESS
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