Lena Ekenvall

Computer mouse and track-ball operation:: Similarities and differences in posture, muscular load and perceived exertion

Mats Hagberg, Eva Bernmark, Lena Karlqvist, 1999 .

Back injuries among nursing personnel — identification of work conditions with cluster analysis

Mats Hagberg, Ewa Menckel, A. Kjellberg, 2001 .

Risk Indicators for Reported Over-Exertion Back Injuries among Female Nursing Personnel

Mats Hagberg, Inga-Lill Engkvist, Ewa Menckel, 2000, Epidemiology.