De Bórtoli, Bruno J.; Bassino, Lilia P.; Caso, Juan P.; Ennis, Ana I. (2020). «A Gemini/GMOS study of the bright elliptical galaxy NGC 3613 and its globular cluster system». Monthly Notices of the Royal Astronomical Society492 (3): 4313–4324. doi:10.1093/mnras/staa086.