BANJA LUKA (Bosnia and Herzegovina), August 1 (SeeNews) – Bosnian oil refinery Rafinerija Nafte Brod [BANJ:RNAF-R-A] said on Wednesday its net loss narrowed to 6.1 million marka ($3.6 million/3.1 million euro) in the first half of 2018, from 7.5 million marka a year earlier.