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Alarcón, Jose Manuel; Hagelstein, Franziska; Lensky, Vadim; Pascalutsa, Vladimir (2020). Forward doubly-virtual Compton scattering off the nucleon in chiral perturbation theory: The subtraction function and moments of unpolarized structure functions. Physical review. D - particles, fields, gravitation, and cosmology, 102(1), 014006. American Physical Society 10.1103/PhysRevD.102.014006