The respect of the guarantee of the principle of the contradictory in the procedure arbitral, even irrital, must be to be appreciated in a key essentially substantial, not anchor anchor the judgment de quo to verification of the sun formalities possibly i i MIPOSE from the referees, but necessary instead ensure that the decision is the fruit of the evaluation of arguments defensive and of evidents evidentiary on which the parts they have way to carry out the their evaluation and formulate any observations.