BANJA LUKA (Bosnia and Herzegovina), April 26 (SeeNews) – Bosnian oil refinery Rafinerija Nafte [BANJ:RNAF-R-A] said on Friday its net loss widened to 12.9 million marka ($8.7 million/6.6 million euro) in the first quarter of 2013 from 10.5 million marka a year earlier.