Contra-ω-Continuous and Almost Contra-ω-Continuous

@article{AlOmari2007ContraContinuousAA,
  title={Contra-ω-Continuous and Almost Contra-ω-Continuous},
  author={Ahmad Al-Omari and Mohd Salmi Md Noorani},
  journal={Int. J. Math. Mathematical Sciences},
  year={2007},
  volume={2007},
  pages={40469:1-40469:13}
}