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\bibitem{Varyukhin_etal1990} Varyukhin SV, Zakharov AA, Gershenzon EM, Gol{\textquoteright}tsman GN, Ptitsina NG, Chulkova GM. Low energy excitation in La$_{2}$CuO$_{4}$. Sverkhprovodimost{\textquoteright}: Fizika, Khimiya, Tekhnika. 1990;3(5):832--7.

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