A. J. Al-Kaaby, W.; H. Al-Hamadani, A.; K. A. Al-Shebli, M. Relative Gene Expression for Genes and Virulence Factors Formation of Biofilms of Streptococcus Mutans Bacteria Using Polymerase Chain Reaction in Real-Time (RT-PCR). QJPS 2018, 22, 775 - 790.