1. G. Dupouy, Jernkonto Ann. 155, 393 (1971).
2. H. Hashimoto, Jernkont. Ann. 155, 480 (1971).
3. G. Dupouy, Adv. Opt. Elect. Micros. 2, 167 (1967).
4. V. E. Cosslett, Sci. Prog., Oxf. 55, 15 (1967); Contemp.Phys. 9, 333 (1968); Quart. Rev. Biophys. 2, 95 (1969).
5. M. J. Makin and J. V. Sharp, J. Mater. Sci. 3, 360 (1968).