Xu, J., Brenner, T. J. K., Chen, Z., Neher, D., Antonietti, M., & Shalom, M. (2014). Upconversion-agent induced improvement of g-c3n4 photocatalyst under visible light. ACS Applied Materials and Interfaces, 6(19), 16481-16486. doi:10.1021/am5051263.