  This paper presents the extended results of measurements of
$W^{\pm}W^{\pm}jj$ production and limits on anomalous quartic gauge couplings
using 20.3 ${\rm fb}^{-1}$ of proton-proton collision data at $\sqrt{s}=8$ TeV
recorded by the ATLAS detector at the Large Hadron Collider. Events with two
leptons ($e$ or $\mu$) with the same electric charge and at least two jets are
analyzed. Production cross-sections are determined in two fiducial regions,
with different sensitivities to the electroweak and strong production
mechanisms. An additional fiducial region, particularly sensitive to anomalous
quartic gauge coupling parameters $\alpha_4$ and $\alpha_5$, is introduced,
which allows more stringent limits on these parameters compared to the previous
ATLAS measurement.
