1. [Initial entry into force] This Convention shall enter into force one month after five States have deposited their instruments of ratification, acceptance, approval or accession, as the case may be, provided that at least three of the said instruments have been deposited by States party to the Act of 1961/1972 or the Act of 1978.
2. [Subsequent entry into force] Any State not covered by paragraph (1) or any intergovernmental organization shall become bound by this Convention one month after the date on which it has deposited its instrument of ratification, acceptance, approval or accession, as the case may be.
3. [Closing of the 1978 Act] No instrument of accession to the Act of 1978 may be deposited after the entry into force of this Convention according to paragraph (1), except that any State that, in conformity with the established practice of the General Assembly of the United Nations, is regarded as a developing country may deposit such an instrument until December 31, 1995, and that any other State may deposit such an instrument until December 31, 1993, even if this Convention enters into force before that date.