If in a contract contract audience stipulated a followed of tender tender per lactation private launched by a municipality, the parts have express express recall, part integral of the contract to, at rules of the specifications general for le public works approved with d.p.r 16 July 1962 n. 1063, between which are including those relative to competence referee per the definition of with Tringsie, not there is needs a separate clause skilled, place that the will of the contractors find already its expression per relationem perfectm in call pact; in this case the source of the competence referee it must be identified not in the law, but in a convention compromise concretely intercoured between the parts, from to which it also derives the force binding of the convention itself.