The study of the neutral pion production in proton-proton collisions at beam momenta 1581 and 1683 MeV/cV. V. Sarantsev, K. N. Ermakov, V. I. Medvedev, T. S. Oposhnyan, O. V. Rogachevsky and S. G. ShermanEur. Phys. J. A, 21 2 (2004) 303-312DOI: https://doi.org/10.1140/epja/i2003-10207-y