T. Nogueira, M. Semedo, and E. Cunha, “Essential Heavy Metals in Renal Tumor Tissue and Its Possible Relation to Carcinogenesis: Applying the Scanning Electron Microscopy Coupled with X-Ray Microanalysis Technique”, Int J Med Stud, vol. 3, no. 1, pp. 10–14, Feb. 2015.