The form writing is requirement validity of the clause compromise; such a requirement nonndimeno not postula that the will negotiale it is indefactibly express in a unique document i play the contextual subscription of both the parts, well to make even with with exchange of the missives containing respectively the proposal and acceptance of the referral of the dispute ad referees, having to interpret the request of constitution a a college arbitration and the relative acceptance as concorde will of compromise the lite in referees.