Balach, J., Wu, H. P., Polzer, F., Kirmse, H., Zhao, Q., Wei, Z. X., et al. (2013). Poly(ionic liquid)-derived nitrogen-doped hollow carbon spheres: synthesis and loading with Fe₂O₃ for high-performance lithium ion batteries. RSC Advances, 3(21), 7979-7986. doi:10.1039/C3RA41229F.