Proofs will be sent to the authors for their correction, preferably by email in PDF format. The authors should return the corrected text in the same way, using the system of "add notes", or on paper, by snail mail. Corrections should be limited, except in justified circumstances, to orthographic or typographic errors. If the number of errors detected is excessive in the first proofs, the Technical Management may send a second set of proofs. These serve to allow the authors to verify that all the corrections indicated in the first proofs have been incorporated. New corrections should not be made, with the exception of typographic errors made by the Editorial Production Team.