Diez, B., R. Cordo Russo, M. J. Teijo, S. Hajos, A. Batlle, and H. Fukuda. “ROS Production by Endogenously Generated Protoporphyrin Ix in Murine Leukemia Cells”. Cellular and Molecular Biology, vol. 55, no. 2, July 2009, pp. 15-19, https://mail.cellmolbiol.org/index.php/CMB/article/view/1082.