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Y. Shimizu, K.S. Ikeda, and S. Sawada, “Spontaneous alloying in binary metal microclusters: A molecular dynamics study,” Phys. Rev. B 64, 075412 (2001); S. Sawada, Y. Shimizu, and K.S. Ikeda, “Molecular dynamics simulations of rapid alloying of microclusters using a many-body potential,” ibid., 67, 024204 (2003).