How to renormalize integral equations with singular potentials in effective field theoryE. Epelbaum, A. M. Gasparyan, J. Gegelia, Ulf-G. Meißner and X.-L. RenEur. Phys. J. A, 56 5 (2020) 152DOI: https://doi.org/10.1140/epja/s10050-020-00162-4