1 Subjects: “...efficiency...”

2 Subjects: “...combined effect...”

3 Subjects: “...energy efficiency in industry...”

4 Subjects: “...efficiency...”

5 Subjects: “...environmental efficiency...”

6 Subjects: “...environmental quality...”

7 Subjects: “...environmental pollution control investment efficiency...”

8 Subjects: “...environmental assessment...”

9 Subjects: “...environmental impact assessment...”

10 Subjects: “...efficiency...”

11 Subjects: “...firm efficiency...”

12 Subjects: “...environmental stresses...”