1. Lockner, J., Goldblatt, P. J. & Leighton, J. Cancer 30, 1632–1644 (1970).
2. Dingemans, K. P. J. natn. Cancer Inst. 53, 1813–1824 (1974).
3. Woods, S. Jr, Baker, R. R. & Marzocchi, B. The Proliferation and Spread of Neoplastic Cells 495–506 (Williams and Wilkens, Baltimore).
4. Babai, F. B. & Tremblay, G. Cancer Res. 32, 2765–2770 (1972).
5. Easty, D. M. & Easty, G. C. Br. J. Cancer 29, 36–49 (1974).