1. Effects of operator stance on pushing and pulling tasks;Ayoub;American Institute of Industrial Engineers Transactions,1974
2. Patient Lifting Devices in Hospitals;Bell,1984
3. Hospital ward patient-lifting tasks;Bell;Ergonomics,1979
4. Postural Discomfort Evaluation of Production Workers;Blache,1987
5. Physical performance and perceived exertion;Borg,1962