Stata Tip 42: The Overlay Problem: Offset for Clarity
Author: Cui, James.  Published in: The Stata Journal: Promoting communications on statistics and Stata, v. 7  no. 1, pp. 141- 142  Date: 2007
ISSN:  1536-867X,  EISSN:  1536-8734  DOI:  10.1177/1536867X0700700112 
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