The HF-2000, a cold field emission transmission electron microscope S. Isakozawa, Y. Kashikura, Y. Sato, T. Takahashi, M. Ichihashi and H. Murakoshi Microsc. Microanal. Microstruct., 1 2 (1990) 159-163 DOI: 10.1051/mmm:0199000102015900