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by Ji, Lizhen; Oort, Frans; Yau, Shing-Tung
by Oort, Frans
by Faber, Carel; Van Der Geer, Gerard; Oort, Frans
by Chai, Ching-Li; Conrad, Brian; Oort, Frans
by Hauser, Herwig; Lipman, Joseph; Oort, Frans; et al.
by Van Der Geer, Gerard; Faber, C.; Oort, Frans