[en] The differential in the variables T (momentum of the most energetic parton) and x sub(perpendicular) (transverse momentum with respect to the axis T vector momentum of each of the two remaining partons) cross section of the three-jet process e⁺e^- → q anti qg is calculated in the first order of QCD. The transverse momentum distribution is also found that is integrated over all T in the range of values T admissible for the three-jet event. The contribution in the mentioned distributions of the three regions, differing by the relative value of the gluon momentum, is investigated with a view to reveal the possibility of identification of quark-antiquark and gluon jets