1 Subjects: “...economic efficiency of industrial water use (ECEIW)...”

2 Subjects: “...Environmental Efficiency...”

3 Subjects: “...N efficiency...”

4 Subjects: “...efficiency...”

5 Subjects: “...energy utilization efficiency...”

6 Subjects: “...self-efficiency sense...”

7 Subjects: “...efficiency engines...”

8 Subjects: “...efficiency evaluation...”

9 Subjects: “...equity and efficiency...”

10 Subjects: “...Relative efficiency...”

11 Subjects: “...technical efficiency...”

12 Subjects: “...OEE-Overall Equipment Efficiency...”

13 Subjects: “...energy efficiency in buildings...”

14 Subjects: “...pump efficiency...”

15 Subjects: “...energy-efficient...”

16 Subjects: “...efficiency hypothesis...”

17 Subjects: “...efficiency assessment...”

18 Subjects: “...efficiency...”

19 Subjects: “...water-efficient products...”

20 Subjects: “...high efficiency...”