(en) M. E. Davies et al., Report of the IAU Working Group on Cartographic Coordinates and Rotational Elements of the Planets and Satellites, vol. 63, (DOI10.1007/BF00693410, Bibcode1996CeMDA..63..127D), chap. 2, p. 127
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(en) M. E. Davies et al., Report of the IAU Working Group on Cartographic Coordinates and Rotational Elements of the Planets and Satellites, vol. 63, (DOI10.1007/BF00693410, Bibcode1996CeMDA..63..127D), chap. 2, p. 127