Hirai, K.; Kumakiri, M.; Ueda, K.; Imamura, Y.; Noriki, S.; Nishi, Y.; Kato, H.; Fukuda, M. Clonal Evolution and Progression of 20-Methylcholanthrene-Induced Squamous Cell Carcinoma of Mouse Epidermis As Revealed by DNA Instability and Other Malignancy Markers. Eur J Histochem 2009, 45, 319-32.