A simplified type of spectrometer of high aperture ratio.
Vasil'ev, R. F.,author.
Stuart, J.,translator.
Great Britain.United Kingdom Atomic Energy Authority,issuing body.
Great Britain.Her Majesty's Stationery Office.
"From Opteko-mekhanicheskaya promyshlennost. (By R.F. Vasil'ev). Translated by J. Stuart".