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The following text is the abstract sent to the authors last July. It was intended to illustrate the reasons for the magazine issue. It seemed to the editors of some use to propose it at the opening also to the readers.doi:10.1283/fam/issn2039-0491/n51-2020/319 doaj:54bb9305f799457984b6eb6a9945089b fatcat:prc4nbi4fzfljjlztuwzbhwbm4