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J W E Drewitt; P S Salmon; A C Barnes; S Klotz; H E Fischer; W A Crichton (2010). "Structure of GeO2 glass at pressures up to 8.6 GPa". Physical Review B81: 014202. doi:10.1103/PhysRevB.81.014202. Bibcode: 2010PhRvB..81a4202D.