How to renormalize integral equations with singular potentials in effective field theory E. Epelbaum, A. M. Gasparyan, J. Gegelia, Ulf-G. Meißner and X.-L. Ren Eur. Phys. J. A, 56 5 (2020) 152 Published online: 26 May 2020 DOI: 10.1140/epja/s10050-020-00162-4