1 Subjects: “...OWA operator...”

2 Subjects: “...operation research...”

3 Subjects: “...machining operations...”

4 Subjects: “...fraction operator...”

5 Subjects: “...HVAC operation...”

6 Subjects: “...operational restrictions on facilities...”

7 Subjects: “...operational benefits...”

8 Subjects: “...color revolution operator...”

9 Subjects: “...mass operator...”