1. High density direct read after write (DRAW) recording;Pepperl;Opt. Acta,1977
2. An optical disk replaces 25 mag tapes;Kenny;I.E.E.E. Spectrum,1979
3. Study on the light beam memory;Yamamoto;Shingaku (C)
4. Ten billion bits on a disk;Bulthvis;I.E.E.E. Spectrum,1979
5. Yamamoto et al. Optical disk using TeO2 films, Shingakugipo, CPM 81-67 (1981-11).