Multi-attribute decision making parametric optimization in two-stage hot cascade vortex tube through grey relational analysisRacharla Madhu Kumar, NVVS Sudheer and Katam Ganesh BabuInt. J. Simul. Multidisci. Des. Optim., 11 (2020) 21DOI: https://doi.org/10.1051/smdo/2020015