Photodynamic therapy of non-melanoma malignant tumors of the skin using topical delta-aminolevulinic acid sensitisation and laser irradiation. - Svanberg,K.; Andersson,T.; Killander,D.; Wang,I.; Stenram,U.; Andersson-Engels,S.; Berg,R.; Johansson,J.; Svanberg,S. (Br J Dermatol, 1994)