Improved chiral nucleon-nucleon potential up to next-to-next-to-next-to-leading order E. Epelbaum, H. Krebs and U. -G. Meißner Eur. Phys. J. A, 51 5 (2015) 53 Published online: 12 May 2015 DOI: 10.1140/epja/i2015-15053-8