^ 3.03.1Greenwood, N. N.; Earnshaw, A. Chemistry of the Elements 2nd. Oxford:Butterworth-Heinemann. 1997. ISBN 0-7506-3365-4.
^Formation and Structure of a Dense Octahedral Glass, M. Guthrie, C. A. Tulk, C. J. Benmore, J. Xu, J. L. Yarger, D. D. Klug, J. S. Tse, H-k. Mao, R. J. Hemley, Physical Review Letters, 93, 115502, doi:10.1103/PhysRevLett.93.115502
^Structural evolution of rutile-type and CaCl2-type germanium dioxide at high pressure, J. Haines, J. M.Léger, C.Chateau, A. S.Pereira, Physics and Chemistry of Minerals, 27, 8 ,(2000), 575-582,doi:10.1007/s002690000092
^ 6.06.1Egon Wiberg, Arnold Frederick Holleman, (2001) Inorganic Chemistry, Elsevier ISBN 0123526515
^Thiele, Ulrich K. The Current Status of Catalysis and Catalyst Development for the Industrial Process of Poly(ethylene terephthalate) Polycondensation. International Journal of Polymeric Materials. 2001, 50 (3): 387 – 394. doi:10.1080/00914030108035115.