Bisht, D.; Zhu, Qingfeng; Yadav, R K S.; Ganesh, Shashikiran; Rangwal, Geeta; Durgapal, Alok; Sariya, Devesh P.; Jiang, Ing-Guey (2021). «Multicolour photometry and Gaia EDR3 astrometry of two couples of binary clusters (NGC 5617 and Trumpler 22) and (NGC 3293 and NGC 3324)». Monthly Notices of the Royal Astronomical Society503 (4): 5929-5947. arXiv:2103.04596. doi:10.1093/mnras/stab691.
Bisht, D.; Zhu, Qingfeng; Yadav, R K S.; Ganesh, Shashikiran; Rangwal, Geeta; Durgapal, Alok; Sariya, Devesh P.; Jiang, Ing-Guey (2021). «Multicolour photometry and Gaia EDR3 astrometry of two couples of binary clusters (NGC 5617 and Trumpler 22) and (NGC 3293 and NGC 3324)». Monthly Notices of the Royal Astronomical Society503 (4): 5929-5947. arXiv:2103.04596. doi:10.1093/mnras/stab691.