1 Subjects: “...Combustion efficiency...”

2 Subjects: “...technical and super-efficiencies...”

3 Subjects: “...efficiency...”

4 Subjects: “...energy-efficient...”

5 Subjects: “...technical efficiency...”

6 Subjects: “...energy efficiency...”

7 Subjects: “...efficiency...”

8 Subjects: “...eco-efficiency...”

9 Subjects: “...firm efficiency...”

10 Subjects: “...asymptotic efficiency...”

11 Subjects: “...PCS efficiency...”

12 Subjects: “...PCS efficiency...”

13 Subjects: “...high computational efficiency...”

14 Subjects: “...high computational efficiency...”