1. 4) U. VALDRÈ : High Voltage Electron Microscopy, ed. by P. R. SWANN, C. J. HUMPHREYS, and M. J. GORINGE (1974), p. 124 [Acad. Press.]
2. 6) E. P. BUTLER and K. F. HALE : Practical Methods in Electron Microscopy, ed. by A. M. GLAUERT, 9 (1981) [North-Holl and Publ.]
3. 8) T. IMURA : Electron Microscopy 1980, Vol. 4 (1980), p. 280
4. 12) M. TANINO and H. KOMATSU : Electron Microscopy 1982, Vol. 2 (1982), p. 547
5. 15) H. MORIKAWA and T. SATO : Microscopie électronique à haute tension (1975), p. 289 [Soc. Française de Microscopie Electronique]