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We analyze the associated production at future high--energy $e^+e^-$colliders, of first generation sleptons with neutralinos and charginos in themodes $e^+ e^-$ and $e \gamma$, in the framework of the Minimal Supersymmetricextension of the Standard Model. We show that the production rates, inparticular for associated production of right--handed selectrons and thelightest neutralino which in general is the first accessible kinematically, canbe much larger than the corresponding ones for second and third generationscalar leptons and for scalar quarks. With the high--luminosities expected atthese colliders, the detection of first generation sleptons with massessignificantly above the kinematical two--body threshold, $\sqrt{s}=2m_{\tilde{l}}$, is thus possible in favourable regions of the parameter space.Comment: 24 pages, latex, axodraw.sty, 6 figure

Associated production of sfermions and gauginos at high-energy ee colliders: The case of selectrons and electronic sneutrinos