1. A contract concluded between persons who, or whose agents, are in the same country at the time of its conclusion is formally valid if it satisfies the formal requirements of the law which governs it in substance under this Regulation or of the law of the country where it is concluded.
2. A contract concluded between persons who, or whose agents, are in different countries at the time of its conclusion is formally valid if it satisfies the formal requirements of the law which governs it in substance under this Regulation, or of the law of either of the countries where either of the parties or their agent is present at the time of conclusion, or of the law of the country where either of the parties had his habitual residence at that time.
3. A unilateral act intended to have legal effect relating to an existing or contemplated contract is formally valid if it satisfies the formal requirements of the law which governs or would govern the contract in substance under this Regulation, or
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