1. Ball, P. The group 3 dilemma. Chemistry World (21 April 2017); http://go.nature.com/2DDblBV
2. Gheewala, T., Skwor, T. & Munirathinam, G. Oncotarget 8, 30524–30538 (2017).
3. Spetz, J. et al. BMC Cancer 17, 528–539 (2017).
4. Swärd C. et al. World J. Surgery 34, 1368–1372 (2010).
5. Bounouira, H., Choukri, A., Elmoursli, R. C., Hakam, O. K. & Chakiri, S. J. Appl. Sci. Environ. Manage. 11, 57–60 (2007).