Walden, T. L., Al-Ansari, H. M. and Farkas, W. R. (1987) “Elevation of Blood Levels of Zinc Protoporphyrin by Radiomimetic Drugs and Friend Leukemia Virus”, Acta Oncologica, 26(3), pp. 223–228. doi: 10.3109/02841868709091436.