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We investigate their change with partial non-isoelectronic substitutions, chemical and hydrostatic pressure. Low-temperature electrical resistivity, specific heat and magnetic susceptibility of Yb(Rh$_{1-x}$T$_x$)$_2$Si$_2$ with T=Fe or Ni for $x\\leq 0.1$, magnetic fields $B\\leq 0.3$~T (applied perpendicular to the c-axis) and hydrostatic pressure $p\\leq 1.5$~GPa are reported. 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