Batzer Paper Summary:
http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?holding=npg&cmd=Retrieve&db=PubMed&list_uids=7991620&dopt=Abstract
Identifiction and Characterization of Two Polymorphic Ya5 Alu Repeats:
http://batzerlab.lsu.edu/Publications/Arcot%20et%20al.%201997%20Mut%20Res%20Genomics.pdf
Standardized Nomenclature for Alu Repeats:
http://batzerlab.lsu.edu/Publications/Batzer%20et%20al.%201996%20J%20Molecular%20Evolution%20(nomenclature).pdf
World-wide survey:
http://www.promega.com/geneticidproc/eusymp2proc/01.pdf
Compared to the World:
http://www.eva.mpg.de/genetics/pdf/alupaper.pdf