Millis، R.L؛ Wasserman, Bowell؛ Franz, Klemola؛ Dunham (1984). "The diameter of 375 URSULA from its occultation of AG + 39 deg 303". Astronomical Journal. ج. 89: 592–596. Bibcode:1984AJ.....89..592M. DOI:10.1086/113553.
Millis، R.L؛ Wasserman, Bowell؛ Franz, Klemola؛ Dunham (1984). "The diameter of 375 URSULA from its occultation of AG + 39 deg 303". Astronomical Journal. ج. 89: 592–596. Bibcode:1984AJ.....89..592M. DOI:10.1086/113553.