Yung Puga, G. L., R. Rieben, L. Bühler, H.-J. Schuurman, and J. D. Seebach. “Xenotransplantation: Where Do We Stand in 2016?”. Swiss Medical Weekly, vol. 147, no. 0506, Feb. 2017, p. w14403, doi:10.4414/smw.2017.14403.