95.85.−e Astronomical observations (additional primary heading(s) must be chosen with these entries to represent the astronomical objects and/or properties studied)

M.S. Longair, R.A. Sunyaev “The universal electromagnetic background radiation” 14 569–599 (1972)
98.70.Vc, 98.54.Aj, 95.85.−e, 98.70.Lt, 98.35.Jk (all)
M.M. Butslov, V.V. Prokof’eva et al “Image converters, light amplifiers and their application in science and technology” 14 524–529 (1972)
42.79.Ls, 95.85.−e, 95.55.−n (all)

PACS numbers