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Tosapolporn Pornpibunsompop,  Non-Destructive Evaluation of Launch Tube Welds with Radiography.   journal   = {International Journal of Mechanical, Aerospace, Industrial, Mechatronic and Manufacturing Engineering}, [online]. World Academy of Science, Engineering and Technology. August 2012, vol. 68(8). 1653 - 1655[viewed 18 December 2017]. Available from: http://waset.org/publications/2442.