1. [20] Papavassiliou G. C. et al, to be published: (la′-9c) (mp=210 °C) prepared according to Scheme 2 gave conducting salts.
2. [30] Lagouvardos D. J. and Papavassiliou G. C. , compounds based on (9), (11) are reported, to be published in Z.Naturforsch.
3. [23] Some ethylenedioxy-tetrachalcogenafulvalenes were found to be more volatile than the ethylenedithio and ethylenediseleno- analogs and can be easily deposited; G.C. Papavassiliou, unpublished.
4. New tetraheterafulvalenes, metal 1,2-diheterolenes and some of their products
5. [25] Zambounis J. S. , et al, to be published in Adv. Mat., and these proceedings.