P. C. Thomas; J. Veverka; D. Simonelli; P. Helfenstein; B. Carcich; M. J. S. Belton et al. (1994). "The Shape of Gaspra". Icarus107 (1): 23–36. doi:10.1006/icar.1994.1004. Bibcode: 1994Icar..107...23T.
Georgij A. Krasinsky; Elena V. Pitjeva; Vasilyev, M. V.; Yagudina, E. I. (July 2002). "Hidden Mass in the Asteroid Belt". Icarus158 (1): 98–105. doi:10.1006/icar.2002.6837. Bibcode: 2002Icar..158...98K.
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P. C. Thomas; J. Veverka; D. Simonelli; P. Helfenstein; B. Carcich; M. J. S. Belton et al. (1994). "The Shape of Gaspra". Icarus107 (1): 23–36. doi:10.1006/icar.1994.1004. Bibcode: 1994Icar..107...23T.
Georgij A. Krasinsky; Elena V. Pitjeva; Vasilyev, M. V.; Yagudina, E. I. (July 2002). "Hidden Mass in the Asteroid Belt". Icarus158 (1): 98–105. doi:10.1006/icar.2002.6837. Bibcode: 2002Icar..158...98K.
