Star, W. et al. 2006. Topical 5-aminolevulinic acid mediated photodynamic therapy of superficial basal cell carcinoma using two light fractions with a two-hour interval: long-term follow-up. Acta Dermato-Venereologica. 86, 5 (Sep. 2006), 412–417. DOI:https://doi.org/10.2340/00015555-0129.