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Navajyoti Panda and  R. S. Pawar,  Optimization of Process Parameters Affecting on Spring-Back in V-Bending Process for High Strength Low Alloy Steel HSLA 420 Using FEA (HyperForm) and Taguchi Technique.  [online]. World Academy of Science, Engineering and Technology. September , vol. -2006(9). 1 - 5[viewed 25 April 2018]. Available from: http://waset.org/abstracts/82474 .