Cobalt oxide magnetic nanoparticles-chitosan nanocomposite based electrochemical urea biosensor. - Ali, A.; Israr-Qadir, M.; Wazir, Z.; Tufail, M.; Ibupoto, Z.; Jamil-Rana, S.; Atif, M.; Khan, S.; Willander, M. (Indian Journal of Physics, 2015)