1 Subjects: “...Human-Robot Collaboration; Human-Robot Interaction; Human-Machine System; Socio-Technical System...”

2 Subjects: “...safe physical human–robot collaboration...”

3 Subjects: “...Human-robot-collaboration...”

4 Subjects: “...human robot collaboration...”

5 Subjects: “...human-robot collaboration...”

6 Subjects: “...human-robot collaboration...”

7 Subjects: “...human–robot collaboration...”

8 Subjects: “...human–robot collaboration...”

9 Subjects: “...human-robot collaboration...”

10 Subjects: “...human robot collaboration...”

11 Subjects: “...human-robot collaboration...”

12 Subjects: “...human-robot collaboration...”

13 Subjects: “...human–robot collaboration...”