Bartel, W.(1985). A measurement of the total cross section and a study of inclusive muon production for the process e+e−→ hadrons in the energy range between 39.79 GeV and 46.78 GeV. Physics Letters B, 160(4-5), 337-342. doi:10.1016/0370-2693(85)91339-5

Bartel, W. "A Measurement of the Total Cross Section and a Study of Inclusive Muon Production for the Process E+e−→ Hadrons in the Energy Range between 39.79 GeV and 46.78 GeV". Physics Letters B, 160.4-5 ( 1985 ): 337-342.