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