1. Analysis of Straight-Line Data;Acton,1959
2. Myoelectric back muscle activity in standardized lifting;Andersson,1976
3. Myoelectric activity in individual lumbar erector spinae muscles in sitting;Andersson;Scand. J. Rehab. Med. Suppl.,1974
4. Myoelectric back muscle activity during sitting;Andersson;Scand. J. Rehab. Med. Suppl.,1974
5. Quantitative evaluation of the activity of the back muscles in lifting;Asmussen;Comm. Dan. Nat. Assn. Infant Paral.,1975