52 Europa
G. Michalak Determination of asteroid masses II. (6) Hebe, (10) Hygiea, (15) Eunomia, (52) Europa, (88) Thisbe, (444) Gyptis, (511) Davida and (704) Interamnia , Astronomy & Astrophysics, Vol. 374, p. 703 (2001)