The manuscript received will be submitted to two external referees, and returned to the author(s) for final writing, in a blind peer review. After modifications according to the referees' comments, the revised paper should be sent to the Section Editor attached to an e-mail. The Section Editor proposes the publication of the paper to the Editor-in-Chief. Exceptionally, authors can receive comments or suggestions from the Editor-in-Chief. Proof-prints are sent to the authors by e-mail in a PDF file. Authors should examine them carefully and send by e-mail the misprints observed. Modifications of the paper's content are not allowed in print- proofs.