Wheeler, Gerard F.; Crummett, William P. (1987). "The Vibrating String Controversy". American Journal of Physics55 (1): 33–37. doi:10.1119/1.15311. Bibcode: 1987AmJPh..55...33W.
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Wheeler, Gerard F.; Crummett, William P. (1987). "The Vibrating String Controversy". American Journal of Physics55 (1): 33–37. doi:10.1119/1.15311. Bibcode: 1987AmJPh..55...33W.