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May 15 (Reuters) - Abertis Infraestructuras SA
* Abertis will not respond to Monday's Atlantia offer in the short term says a source with knowledge of the process.
* Italian infrastructure group Atlantia launched a cash-and-share offer for Abertis on Monday, in a deal that values the Spanish rival at 16.34 billion euros ($18 billion). Further company coverage: ($1 = 0.9134 euros) (Reporting By Carlos Ruano; Editing by Sonya Dowsett)