[http://www.iienet2.org/uploadedFiles/Webcasts/Determining%20Economic%20Production%20Quantities%207-14-09.pdf]* Cárdenas-Barrón, L. E. “The Economic Production Quantity derived Algebraically” International Journal of Production Economics, Volume 77, Issue 1, (2002).
[http://www.iienet2.org/uploadedFiles/Webcasts/Determining%20Economic%20Production%20Quantities%207-14-09.pdf]* Cárdenas-Barrón, L. E. "The Economic Production Quantity derived Algebraically" International Journal of Production Economics, Volume 77, Issue 1, (2002).