References
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- Consumer Research Center Report. California System Awareness Study. 2001, Albuquerque, NM
- Edge Branding, Oklahoma City 2002, OK
- Stata Version 7.0 Intercooled. StataCorp Station, , TX 2001
- Minitab Release 13. Minitab Inc., State College, PA 1999
- Litovitz T L. Data…Data…Data!. The Poison Line 2003; 21: 2–3, Limited distribution newsletter of the AAPCC
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