Brussels (AFP) - Eurozone nations will hold an emergency summit on Tuesday to discuss the Greek referendum "No" result after the German and French leaders called for a meeting, EU president Donald Tusk said.The special meeting comes as Brussels reels with the implications of what the head of the Eurogroup of finance ministers from the 19-country block, Jeroen Dijsselbloem, called a "very regrettable" decision."I have called a EuroSummit Tuesday evening at 18h (1600 GMT) to discuss situation after referendum in Greece," Tusk said on Twitter on Sunday after Greek voters said a resounding "No" to creditor demands for further austerity in return for bailout funds.It will come just 15 days after another eurozone summit called by Tusk failed to seal a deal between Greece and its EU-IMF creditors.The Eurogroup will also hold a meeting on Tuesday before the summit to "discuss the state of play", Dijsselbloem said, while deputy finance ministers from the eurozone will meet on Monday."I take note of the outcome of the Greek referendum.