Zhou, Qing, et al. "Co-expression of Tim-3 and PD-1 identifies a CD8+T-cell exhaustion phenotype in mice with disseminated acute myelogenous leukemia." Blood (2011): blood-2010.
Peggs, Karl S., et al. "Blockade of CTLA-4 on both effector and regulatory T cell compartments contributes to the antitumor activity of anti–CTLA-4 antibodies." Journal of Experimental Medicine 206.8 (2009): 1717-1725.
Blank, Christian U., and Alexander Enk. "Therapeutic use of anti-CTLA-4 antibodies." International immunology 27.1 (2014): 3-10.