@article{sohail_hergeth_2008, title={Factors affecting the productivity of a complex product mix}, volume={8}, number={3}, journal={AATCC Review}, author={Sohail, S. and Hergeth, H.}, year={2008} }
 @article{sohail_hergeth_2008, title={Productivity in a complex product mix}, volume={8}, number={3}, journal={AATCC Review}, author={Sohail, S. and Hergeth, H.}, year={2008}, pages={33–37} }