Active oxygen intermediates in the degradation of hematoporphyrin derivative in tumor cells subjected to photodynamic therapyTšekulajeva, Ludmilla; Tšekulajev, Vladimir; Ševtšuk, IgorJournal of photochemistry and photobiology B : biology2008 / p. 94-107 : illhttps://www.sciencedirect.com/science/article/pii/S1011134408001474