BANJA LUKA (Bosnia and Herzegovina), August 7 (SeeNews) – Bosnian oil refinery Rafinerija Nafte [BANJ:RNAF-R-A] said on Wednesday its net loss widened to 24.6 million marka ($16.8 million/12.6 million euro) in the first half of 2013 from 9.0 million marka a year earlier.