Reproducing heavy-ion fusion cross sections at extreme sub-barrier energies with a simple formula - Analysis of fusion hindrance with a Gaussian barrier distributionC. L. Jiang, K. E. Rehm, B. B. Back, A. M. Stefanini and G. MontagnoliEur. Phys. J. A, 54 12 (2018) 218DOI: https://doi.org/10.1140/epja/i2018-12655-6