Quantum Critical Magnetic Excitations in Spin-1/2 and Spin-1 Chain Systems od Y. Xu, L. S. Wang, Y. Y. Huang, J. M. Ni, C. C. Zhao, Y. F. Dai, B. Y. Pan, X. C. Hong, P. Chauhan, S. M. Koohpayeh, N. P. Armitage, S. Y. Li

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