1. Castaing, R., thesis, Univ. of Paris (1951). Advances in Electronics and Electron Physics (edit. by Marton, L.), 13, 317 (Academic Press, NY, 1960).
2. Cosslett, V. E., J. Roy. Microsc. Soc., Ser. III, 83, 13 (1964).
3. Mellors, Robert C., and Carroll, Kenneth G., Nature, 192, 1090 (1961).
4. Carroll, Kenneth G., in In Vivo Techniques in Histology (edit. by Bourne, Geoffrey H.), 69 (Williams and Wilkins Company, Baltimore, 1967).
5. Birks, L. S., Electron Probe Microanalysis (Interscience, New York, 1963).