by Dagata, J.A., Tseng, W., Bennett, J., Schneir, J., Harary, H.H.
Published in Ultramicroscopy (1992)

by Harary, H. H., Brown, J. E.
Published in Science (American Association for the Advancement of Science) (20.04.1984)

by Brown, J.E., Coles, J.A., Harary, H.H.
Published in Vision research (Oxford) (1979)