The primary reference to be cited by users of this instrument on Gemini is "The Gemini Near-Infrared Imager" by Hodapp et al., 2003, PASP, 115, 1388.
An early paper describing some aspects of NIRI is "Design of the near-infrared camera for the Gemini telescope" by Hora, J., L., Hodapp, K-W., Irwin, E. M., Keller, T. J., Young, T. T., 1995, SPIE, 2475, 308.