Before revision:  The only work that deals with bounds on both the sides violates both the bounds \mbox{%DIFAUXCMD friggstad_et_al_LBUFL . In this paper, we present the first (constant factor) approximation for the problem violating the upper bound by a factor of \%\textcolor{magenta{(2 + \epsilon)} } (5/2) without violating the lower bounds when both the lower and the upper bounds are uniform.
After revision:  The only work that deals with bounds on both the sides violates both the bounds \mbox{%DIFAUXCMD friggstad_et_al_LBUFL . In this paper, we present the first (constant factor) approximation for the problem violating the upper bound by a factor of {(2 + \epsilon)} } (5/2) without violating the lower bounds when both the lower and the upper bounds are uniform.