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K.B. Tolpygo, "Physical properties of a rock salt lattice made up of deformable ions," Zh. Eks.Teor. Fiz. vol. 20, No. 6, pp. 497–509 (1950), English translation: Ukrainian Journal of Physics, vol. 53, special issue (2008); "Archived copy"(PDF). Archived from the original(PDF) on 2015-12-08. Retrieved 2015-10-15.{{cite web}}: نگهداری یادکرد:عنوان آرشیو به جای عنوان (link)