Bol, A., Dupont, C., Leleux, P., Lipnik, P., Macq, P., & Ninane, A. (1985). Measurement of the Backward-to-90-degrees Neutron-proton Elastic Cross-section Ratio Between 40 and 75 Mev. Physical Review C (Nuclear Physics), 32(1), 308-310. https://doi.org/10.1103/PhysRevC.32.308 (Original work published 1985)