Foëx, GaëlGaëlFoëxMotta, VeronicaVeronicaMottaLimousin, MarceauMarceauLimousinVerdugo, TomasTomasVerdugoGASTALDELLO, FABIOFABIOGASTALDELLO2020-05-152020-05-15201697811070786041743-9213http://hdl.handle.net/20.500.12386/24891We present the analysis of a sample of strong-lensing galaxy group candidates. Our main findings are: confirmation of group-scale systems, complex light distributions, presence of large-scale structures in their surroundings, and evidence of a strong-lensing bias in the mass-concentration relation. We also report the detection of the first 'Bullet group'.ELETTRONICOenConference paper10.1017/S17439213160098812-s2.0-84991373472000452772400033https://www.cambridge.org/core/journals/proceedings-of-the-international-astronomical-union/article/studying-structure-formation-and-evolution-with-stronglensing-galaxy-groups/302A8738FED01E11243D389E122F0EF02016IAUS..308..211FFIS/05 - ASTRONOMIA E ASTROFISICAERC sectors::Physical Sciences and Engineering::PE9 Universe sciences: astro-physics/chemistry/biology; solar systems; stellar, galactic and extragalactic astronomy, planetary systems, cosmology, space science, instrumentation