1. Colucci S., Fidani C. (2022). Preliminary geomorphological and hydrographical characterization of a circular structure in the Marche Region (Central Italy) and its possible origin // Geomorphologie: Relief, Processus, Environnement. – Vol. 28, No. 2. – P. 126-136.
  2. Colucci S., Fidani C. (2023). The outer ring of a circular structure in the Marche Region, Central Italy: Evidence of a non-extraterrestrial origin // Journal of Geography and Cartography. - Vol. 6, No. 2

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