Meadow, J. R.; Reid, E. E. (1934). “Ring compounds and polymers from polymethylene dihalides and dimercaptans”. J. Am. Chem. Soc.56 (10): 2177–2180. doi:10.1021/ja01325a058.
Musker, W. Kenneth (1992). “Coordination Chemistry of Bidentate Medium Ring Ligands (Mesocycles)”. Coordination Chemistry Reviews117: 133–57. doi:10.1016/0010-8545(92)80022-J.