“Genomic Variant Surveillance of SARS-CoV-2 Positive Specimens Using a Direct PCR Product Sequencing Surveillance (DPPSS) Method”. Acta Medica Philippina (June 9, 2025). Accessed June 23, 2025. https://actamedicaphilippina.upm.edu.ph/index.php/acta/article/view/11332.