%0 Journal Article %A Slobodanka Janković %T How to Distinguish Between Record Types %J Yugoslav journal of operations research %D 1999 %P 141 %V 9 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/item/YJOR_1999_9_1_a10/ %G en %F YJOR_1999_9_1_a10