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The process of top-quark pair production followed by semileptonic decays atfuture high-energy e^+e^- linear colliders is investigated as a possible testof physics beyond the Standard Model. Assuming the most general non-standardforms for gamma t t-bar, Z t t-bar and Wtb couplings, the energy spectrum ofthe single lepton l^{+-} and the energy correlation of l^+ and l^- emergingfrom the process e^+e^- --> t t-bar --> l^{+-} ... /l^+l^- ... are calculated.Expected precision of the non-standard-parameter determination is estimatedadopting the recently-proposed optimal method.Comment: Final version, to appear in Int. J. Mod. Phys.

EFFECTS OF NONSTANDARD INTERACTIONS FOR THE ENERGY SPECTRUM OF SECONDARY LEPTONS IN $e^+ e^-\to t\bar t$