Lallave, M.B.J., Ruiz-Rosas, R., Rodriguez-Mirasol, J., Cordero, T., Otero, J.C., Marquez, M., Barrero, A. and Loscertales, I.G. (2007) Filled and hollow carbon nanofibers by coaxial electrospinning of alcell lignin without binder po-lymers. Advanced Materials, 23, 4292-4296.