http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
international symposium, Varna, Bulgaria, May 29-June 2, 1989 : proceedings
Center of Informatics and Computer Technology.
International Symposium on Optimal Algorithms 1989 : Varna, Bulgaria)
Papers presented at the Second International Symposium on Optimal Algorithms held May 29-June 2, 1989, in Varna, Bulgaria, sponsored by the Center of Informatics and Computer Technology of the Bulgarian Academy of Sciences.