(en) Hiroyuki Nakayama, Yasumasa Fujii, Masateru Ishiguro, Ryosuke Nakamura, Sozo Yokogawa, Fumi Yoshida et Tadashi Mukai, « Observations of Polarization and Brightness Variations with the Rotation for Asteroids 9 Metis, 52 Europa, and 1036 Ganymed », Icarus, vol. 146, no 1, , p. 220–231 (DOI10.1006/icar.2000.6396, Bibcode2000Icar..146..220N).
(en) Hiroyuki Nakayama, Yasumasa Fujii, Masateru Ishiguro, Ryosuke Nakamura, Sozo Yokogawa, Fumi Yoshida et Tadashi Mukai, « Observations of Polarization and Brightness Variations with the Rotation for Asteroids 9 Metis, 52 Europa, and 1036 Ganymed », Icarus, vol. 146, no 1, , p. 220–231 (DOI10.1006/icar.2000.6396, Bibcode2000Icar..146..220N).