1.
34. Polycyclic aromatic hydrocarbons. Part XVI. 1 : 2 : 3 : 4-Dibenzphenanthrene C. L. Hewett J. Chem. Soc. 1938 193
2.
Preparation and chemical behaviour of exo-methylene compounds: isoelectronic compounds of 5-methylenecyclohexa-1,3-diene Akira Sugimoto,Junzo Yamano,Masahiro Yasueda,Shigeo Yoneda J. Chem. Soc. Perkin Trans. 1 1988 2579