1. Eng transl.: Parabolotoroidal mirrors as elements of solar energy concentrators;Baranov;Appl. Sol. Energy,1966
2. Baranov V.K., (1967). “Device for Restricting in One Plane the Angular Aperture of a Pencil of Rays from a Light Source” (in Russian). Russian certificate of authorship 200530, specification published October 31, 1967. Describes certain illumination properties of the 2D CPC, called in other Russian publications a FOCLIN.
3. Study of the illumination characteristics of hollow focons;Baranov;Sov. J. Opt. Technol.,1966
4. Brief description of the principle, with photographs to show illumination cut-off and transmission-angle curves plotted from measurements.