Chaabout S., Chennaoui Aoudjehane H., Reimold W.U., Baratoux D., Youbi N. (2015). Prospecting For Possible Impact Structures In Morocco // Journal of African Earth Sciences.
Monika Kumlehn de Mamani & Ingrid Grambow IMPAKTNAMEN: Namen der [Meteorite; Impakte/Krater; Boliden/Fireballs; Tektite] im Sonnensystem.(2016)

Google-Earth image of the Smara site showing the 15 circular and sub-circular structures (Chaabout S. et al., 2015).