8Hoists for the transfer of disabled persons--Requirements and test methods[s]. ISO10535, 2006.
9Roger Bostelman, James Albus. Survey of patient mobility and lift technologies: Toward advancements and standards [R]. Intelligent Systems Division National Institute of Standards and Technology, 2006.
10James. Lifting means [P]. United States Patent: 3,962,737, 1976-06-15.