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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 2018, vol. 12(9). 1108 - 1112[viewed 23 January 2018]. Available from: http://waset.org/abstracts/82474 .