Block, M. M., Bobbink, G. J., Botje, M., Campanini, R., van Driel, M. A., Erne, F. C., Langeveld, W. G. J., Ludwig, H. W., Kooijman, P., Sens, J. C., Timmer, J., van Wezep, D., Favart, D., & Leleux, P. (1980). Correlations between High-Momentum Mesons in p+p→π+π+X at s12=63 GeV. Physical Review Letters, 44, 118-121. https://doi.org/10.1103/PhysRevLett.44.118 (Original work published 1980)