April 20 (SeeNews) - Bosnia and Herzegovina's natural gas distributor Sarajevo Gas has signed a 1.03 billion marka ($619.4 million/526.3 million euro) deal with Serbia’s construction firm Konvar, acting as the lead partner in a consortium with several companies, for the construction of the Sepak-Novi Grad gas pipeline, part of the Eastern Interconnection project, the Serb Republic government said.