Merits and constraints of low-K2 experimental data for the proton radius determinationM. Hoballah, S. Cholak, R. Kunne, C. Le Galliard, D. Marchand, G. Quéméner, E. Voutier and J. van de WieleEur. Phys. J. A, 55 7 (2019) 112DOI: https://doi.org/10.1140/epja/i2019-12799-9