1. Husemann, E. undH. Ruska, J. Prakt. Chem.156, 1 (1940).
2. Boyer, R. F. undR. D. Heidenreich, J. Appl. Phys.16, 621 (1945).
3. Siegel, B. M., D. H. Johnson undH. Mark, J. Polymer Science5, 111 (1950).
4. Nasini, A. G., G. Ostacoli, G. Sacini, G. Maldifassi, Symp. Inter. Chimic. Macromol, S. 432 (Milano 1954).
5. Schoon, Th. G. F., Kautschuk und Gummi1956, 1, 17.F. Grasenik, Radex Rundschau226, Heft 4/5 (1956).Schoon, Th. G. F. undF. Grasenik, Proc. of the first regional Conference for electron microscopy273 (Tokyo 1956).