Xia, G.-G., Tong, W., Tolentino, E. N., Duan, N.-G., Brock, S. L., Wang, J.-Y., et al. (2001). Synthesis and characterization of nanofibrous sodium manganese oxide with a 2 x 4 tunnel structure. Chemistry of Materials, 13(5)(5), 1585-1592. doi:10.1021/cm000777r.