Unveiling regions in multi-scale Feynman integrals using singularities and power geometryB. Ananthanarayan, Abhishek Pal, S. Ramanan and Ratan SarkarEur. Phys. J. C, 79 1 (2019) 57DOI: https://doi.org/10.1140/epjc/s10052-019-6533-x