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\bibitem{Varyukhin_etal1990} Varyukhin, S. V., Zakharov, A. A., Gershenzon, E. M., Gol{\textquoteright}tsman, G. N., Ptitsina, N. G., \& Chulkova, G. M. (1990). Low energy excitation in La$_{2}$CuO$_{4}$. \textit{Sverkhprovodimost{\textquoteright}: Fizika, Khimiya, Tekhnika}, \textit{3}(5), 832--837.

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