See:
-
Piotr Wroniecki, Jan Bulas, Hidden Landscapes of Southern Poland. The application of non-invasive methods and their role in the study of past societies.https://www.academia.edu/30477511Hidden_Landscapes_of_Southern_Poland_The_application_of_non_invasive_methods_and_their_role_in_the_study_of_past_soceities
- https://archeologia.com.pl/tajemnicze-piece-sprzed-2-tys-lat-odkryte-w-rzemienowicach/