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Strong-lensing is often seen in galaxy clusters, as light rays of
background sources get deflected by the cluster's gravitational
potential, forming magnified, distorted, and often multiple images.
We have developed a uniquely efficient method to find and match these
multiple-images to their background sources, model the cluster
lensing configuration and therefore to accurately derive the (dark)
mass distribution. I will talk about this method, and concentrate on
several different cosmological applications and ongoing projects,
using nowadays advanced lensing techniques.
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