Singh, Saravjeet, Minakshi Sharma, and Geeta Singh. “Graphene Oxide Nanoparticles Decorated Pencil Lead As Urea Sensing Electrode”. Asian Journal of Chemistry 33, no. 11 (October 20, 2021): 2857–2863. Accessed April 29, 2024. https://asianpubs.org/index.php/ajchem/article/view/33_11_45.