1、The extended linear expenditure system
Constantino Lluch
European Economic Review
Volume 4, Issue 1, April 1973, Pages 21-32
http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6V64-47MC5PP-3&_user=10&_coverDate=04%2F30%2F1973&_rdoc=1&_fmt=high&_orig=search&_sort=d&_docanchor=&view=c&_searchStrId=1440863022&_rerunOrigin=scholar.google&_acct=C000050221&_version=1&_urlVersion=0&_userid=10&md5=f5866ec64b05e272f7a2d3861144e9f9
2、Linear Expenditure System and Demand Analysis: An Application to the Pattern of British Demand
R Stone
The Economic Journal © 1954
http://www.jstor.org/pss/2227743

3、Statistic Law of Family Expenditures.
H Working -
Journal of the American Statistical Association, 1943
http://www.jstor.org/pss/2279311