Hennawi, J. F., Myers, A. D., Shen, Y., Strauss, M. A., Djorgovski, S. G., Fan, X., Glikman, E., Mahabal, A., Martin, C. L., Richards, G. T., Schneider, D. P., & Shankar, F. (2010). Binary quasars at high redshift - I. 24 new quasar pairs at z ~ 3-4. The Astrophysical Journal, 719(2), 1672-1692. doi:10.1088/0004-637X/719/2/1672.