Role of confined gluons and pions in nucleon-nucleon interaction V. K. Nilakanthan, V. C. Shastry, S. Raghavendra and K. B. Vijaya Kumar Eur. Phys. J. Plus, 134 10 (2019) 517 Published online: 17 October 2019 DOI: 10.1140/epjp/i2019-12908-3