Al-Khafagy, Mohammed T., et al. “The Effect of Using Modified Flask on the Porosity of Processed Heat- Cure Acrylic Resin”. International Journal of Sciences: Basic and Applied Research (IJSBAR), vol. 12, no. 1, Dec. 2013, pp. 189-97, https://gssrr.org/JournalOfBasicAndApplied/article/view/1302.