How to read file in R with column names having brackets?

How to read file in R with column names having brackets?

References

Reference NO 1

http://stackoverflow.com/questions/15194689/how-to-read-file-in-r-with-column-names-having-brackets

Reference NO 2

http://r.789695.n4.nabble.com/How-to-read-file-in-R-with-column-names-having-brackets-td4660198.html

Reference NO 3

http://data.princeton.edu/R/readingData.html

Reference NO 4

http://www.ats.ucla.edu/stat/r/modules/subsetting.htm

Reference NO 5

http://www.stat.berkeley.edu/~spector/Rcourse.pdf

Reference NO 6

http://www.cyclismo.org/tutorial/R/input.html

Reference NO 7

http://cran.r-project.org/doc/contrib/Torfs+Brauer-Short-R-Intro.pdf

Reference NO 8

http://www.springer.com/cda/content/document/cda_downloaddocument/9780387938363-c2.pdf?SGWID=0-0-45-772114-p173894303