Nucleon time-like form factors below the threshold R. Baldini, S. Dubnička, P. Gauzzi, S. Pacetti, E. Pasqualucci and Y. SrivastavaEur. Phys. J. C, 11 4 (1999) 709-715DOI: https://doi.org/epjc/v11/p709(epjc0077)