Spectrum measurements in the Zenith plutonium core 7 using a neutron chopper /
Barclay, F. R.,author.
Cameron, I. R.,author.
Pitcher, H. H. W.,author.
Symons, C. R.,author.
Great Britain.United Kingdom Atomic Energy Authority,issuing body.
Great Britain.Her Majesty's Stationery Office.
"May 1964".