In+case+of+contract+of+contract,+regulated+second+clauses+contained+in+a+attached+a+a+contract+preliminary+of+purchase and sale+between+the+the+parts,+attached+then+also+recalled+in the subsequent+with Department+definitive trait+of+sale,+the+clause+bossial+contained+in+such+attached+validly+attributes+to+referees+the+competence+to+decide+of the+controversies+concerning+the+contract+contract.