Method of deriving Lagrangian for two-dimensional systemsV. K. Chandrasekar, R. Gladwin Pradeep, R. Mohanasubha, M. Senthilvelan and M. LakshmananEur. Phys. J. Plus, 138 1 (2023) 52DOI: https://doi.org/10.1140/epjp/s13360-023-03695-x