Theoretical study of true-muonium μ + μ − formation in muon collision processes μ− + μ+e− and μ+ + pμ− - True-muonium μ+μ− formation in μ−+μ+e− and μ++pμ−Kazuhiro SakimotoEur. Phys. J. D, 69 12 (2015) 276DOI: https://doi.org/10.1140/epjd/e2015-60427-6