TY - JOUR AU - Slobodanka Janković TI - How to Distinguish Between Record Types JO - Yugoslav journal of operations research PY - 1999 SP - 141 VL - 9 IS - 1 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/YJOR_1999_9_1_a10/ LA - en ID - YJOR_1999_9_1_a10 ER -