A review on numerical methods for thickness determination in terahertz time-domain spectroscopySoumya Mukherjee, N. M. Anjan Kumar, Prashanth C. Upadhya and N. KamarajuEur. Phys. J. Spec. Top., 230 23 (2021) 4099-4111DOI: https://doi.org/10.1140/epjs/s11734-021-00215-9