Declarations on the scope of application 1. Any Contracting State may declare, in accordance with article 21, that it will apply this Convention only: (a) When the States referred to in article 1, paragraph 1, are Contracting States to this Convention; or (b) When the parties have agreed that it applies. 2. Any Contracting State may exclude from the scope of application of this Convention the matters it specifies in a declaration made in accordance with article 21. Article 20 Communications exchanged under other international conventions 1. The provisions of this Convention apply to the use of electronic communications in connection with the formation or performance of a contract to which any of the following international conventions, to which a Contracting State to this Convention is or may become a Contracting State, apply: Convention on the Recognition and Enforcement of Foreign Arbitral Awards (New York, 10 June 1958); Convention on the Limitation Period in the International Sale of Goods (New York, 14 June 1974) and Protocol thereto (Vienna, 11 April 1980); United Nations Convention on Contracts for the International Sale of Goods (Vienna, 11 April 1980); United Nations Convention on the Liability of Operators of Transport Terminals in International Trade (Vienna, 19 April 1991); United Nations Convention on Independent Guarantees and Stand-by Letters of Credit (New York, 11 December 1995); United Nations Convention on the Assignment of Receivables in International Trade (New York, 12 December 2001). 2. The provisions of this Convention apply further to electronic communications in connection with the formation or performance of a contract to which another international convention, treaty or agreement not specifically referred to in paragraph 1 of this article, and to which a Contracting State to this Convention is or may become a Contracting State, applies, unless the State has declared, in accordance with article 21, that it will not be bound by this paragraph. 3. A State that makes a declaration pursuant to paragraph 2 of this article may also declare that it will nevertheless apply the provisions of this Convention to the use of electronic communications in connection with the formation or performance of any contract to which a specified international convention, treaty or agreement applies to which the State is or may become a Contracting State. 4. Any State may declare that it will not apply the provisions of this Convention to the use of electronic communications in connection with the formation or performance of 31