Pauling, Linus (1929). "The principles determining the structure of complex ionic crystals". J. Am. Chem. Soc. 51 (4): 1010–1026. doi:10.1021/ja01379a006.
Toofan, Jahansooz (February 1994). "A Simple Expression between Critical Radius Ratio and Coordination Number". Journal of Chemical Education. 71 (2): 147. doi:10.1021/ed071p147. Following the erratum, equations should read and , (where bond angle)