Alexander, S; C. Laermans; R. Orbach; H.M. Rosenberg (15 October 1983). "Fracton interpretation of vibrational properties of cross-linked polymers, glasses, and irradiated quartz". Physical Review B. 28 (8): 4615–4619. Bibcode:1983PhRvB..28.4615A. doi:10.1103/physrevb.28.4615.
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Alexander, S; C. Laermans; R. Orbach; H.M. Rosenberg (15 October 1983). "Fracton interpretation of vibrational properties of cross-linked polymers, glasses, and irradiated quartz". Physical Review B. 28 (8): 4615–4619. Bibcode:1983PhRvB..28.4615A. doi:10.1103/physrevb.28.4615.