Variant patterns and influence of inter-regional travel during the SARS-CoV-2 expansion in South Africa - Weiyu Luo; Xin Wu; Ruohan Li; Meagan Fitzpatrick; Man Charurat; Natalia Blanco; Kristen A. Stafford; Vivek Naranbhai; Alash’le Abimiku; Anna Winters; Chenfeng Xiong (PLoS ONE, 2025)