Argan, P., Audit, G., Bloch, A., de Botton, N., Faure, J. L., Schuhl, C., Tamas, G., Tzara, C., Vincent, E., Van Oystaeyen, B., Deutsch, J., Favart, D., & Prieels, R. (1988). The Threshold Photoproduction of pi0 on Nucleons and on Few Nucleon Systems. Physics Letters. Section B: Nuclear, Elementary Particle and High-Energy Physics. https://doi.org/10.1016/0370-2693(88)91253-1