BANJA LUKA (Bosnia and Herzegovina), December 11 (SeeNews) – PREF, the manager of the state pension fund of Bosnia's Serb Republic, said on Tuesday it will auction its 10% stake in local bag manufacturer Sloga [BANJ:SLOG-R-A] on December 18, setting the starting price at 39,975 marka ($26,544/20,439 euro).