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The potential of $\mu ^{+}\mu ^{-}$ colliders to investigate the fourth SMfamily fermions predicted by flavour democracy has been analyzed. It is shownthat muon colliders are advantageous for both pair production of fourth familyfermions and resonance production of fourth family quarkonia. Also isosingletquarks production at $\mu ^{+}\mu ^{-}$ colliders has been investigated.Comment: 9 pages, 5 table

physical review. d. particles, fields, gravitation, and cosmology/physical review. d. particles and fields

Search for the fourth standard model family fermions and<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi>E</mml:mi></mml:mrow><mml:mrow><mml:mn>6</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>quarks at<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mi>μ</mml:mi></mml:mrow><mml:mrow><mml:mo>+</mml:mo></mml:mrow></mml:msup></mml:mrow><mml:mrow><mml:msup><mml:mrow><mml:…

Search for the fourth standard model family fermions andE6quarks atμ+