Vanest, J.-M. (1975) “Helicenes: The Photochemical Ring-Closure of Polymer-Supported 1,2-Diarylethylenes: Hexahelicene- and benzo[c]phenanthrene-2-carbaldehyde”, CHIMIA, 29(8), p. 343. doi:10.2533/chimia.1975.343.