The practical significance of the field theory. Bedeutung der Feldtheorie für die praktische Lichttechnik. (Translated from) Lichttechnik, 1958, 10 (11), 561-565.
Helwig, Hans Joachim.
Krochmann, J.
Garston, 
1962.
Reproduced from typewriting.
Joint authors: Hans Joachim Helwig and J. Krochmann.