TY  - SER
AU  - 
AU  - 
AU  - 
AU  - 
AU  - 
AU  - 
AU  - 
AU  - 
TI  - An electromyographic analysis of commercial and common abdominal exercises: implications for rehabilitation and training
PY  - 2006///
CY  - Estados Unidos : 
PB  - Journal of orthopaedic & sport physical therapy, 
ER  -