G. Buttazzo, H. Shrivastava: Optimal shapes for general integral functionals Annales Henry Lebesgue 2019 H. Shrivastava: A NON-ISOTROPIC FREE TRANSMISSION PROBLEM GOVERNED BY QUASI-LINEAR OPERATORS AMPA 2020 D. Moreira , H. Shrivastava: OPTIMAL REGULARITY FOR VARIATIONAL SOLUTIONS OF FREE TRANSMISSION PROBLEMS. JMPA (Accepted Paper) 2021