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Hace 7 horas · 1939 - Walther Kossel and Gottfried Möllenstedt published the first work on convergent beam electron diffraction (CBED), It was extended by Peter Goodman and Gunter Lehmpfuhl, then mainly by the groups of John Steeds and Michiyoshi Tanaka who showed how to use CBED patterns to determine point groups and space groups.