Li, Y., Zhao, K., Feng, C., Elsegood, M. R., Prior, T. J., Sun, X., & Redshaw, C. (2014). Ethyleneglycol tungsten complexes of calix[6 and 8]arenes: Synthesis, characterization and ROP of ε-caprolactone. Dalton Transactions : an international journal of inorganic chemistry, 43(36), 13612-13619. https://doi.org/10.1039/c4dt01936a