Version 2 of Level 2 of SBML was published on 26 September 2006.
The specification can be found at:
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https://sbml.org/specifications/sbml-level-2/version-2/revision-1/sbml-level-2-version-2-rev1.pdf
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Identifier for this specification is: https://identifiers.org/combine.specifications:sbml.level-2.version-2
To cite this document use:
Andrew M. Finney, Michael Hucka, and Nicolas Le Novère. (2006). Systems Biology Markup Language (SBML) Level 2: Structures and Facilities for Model Definitions. Retrieved from COMBINE, https://identifiers.org/combine.specifications:sbml.level-2.version-2