Plagiarism was discovered in a manuscript published in Kochi Journal of Mathematics. Based on a review of the two manuscripts in question, the Editorial Board of Kochi Journal of Mathematics has decided to retract the article. The following article is hereby retracted:

N.Gowrisankar:
On $\omega - \beta$-open sets and $\beta$ Lindelof spaces
Kochi J. Math. 6(2011), 53--59.