October 14 (SeeNews) - Croatian oil and gas company INA [ZSE:INA-R-A] and Djuro Djakovic Holding [ZSE:DDJH-R-A] signed a 16.8 million kuna ($3.0 million/2.2 million euro) contract for the construction of a spherical tank in INA's oil refinery in the Adriatic port of Rijeka, Djuro Djakovic said on Monday.