1 Subjects: “...Froude propulsion efficiency...”

2 Subjects: “...technical efficiency...”

3 Subjects: “...computational efficiency...”

4 Subjects: “...energy efficiency...”

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

6 Subjects: “...carbon emissions efficiency...”

7 Subjects: “...efficiency...”

8 Subjects: “...energy-efficient...”

9 Subjects: “...eco-efficiency...”

10 Subjects: “...energy efficiency...”

11 Subjects: “...firm efficiency...”

12 Subjects: “...energy efficiency...”

13 Subjects: “...super-efficient SBM...”