Effects of azimuth-symmetric acceptance cutoffs on the measured asymmetry in unpolarized Drell-Yan fixed-target experimentsA. Bianconi, M. P. Bussa, M. Destefanis, L. Ferrero, M. Greco, M. Maggiora and S. SpataroEur. Phys. J. A, 49 4 (2013) 42DOI: https://doi.org/10.1140/epja/i2013-13042-7