Ragini Singh, Prachi Garg, Anoop Kumar, Sucheta, and Meenal Babra, “Comparison between conventional tube method and gel card technique for blood crossmatching: A study in a tertiary care center of north India”, Int. J. Res. Pharm. Sci., vol. 11, no. 4, pp. 6500–6503, Oct. 2020.