Reid 1996, pp. 1–2; also on pp.  8, Reid notes that there is some ambiguity as to exactly where Hilbert was born.
Truy cập ngày 8 tháng 9 năm 2007.  ^ Reid 1996, pp. 1–2; also on pp. 8, Reid notes that there is some ambiguity as to exactly where Hilbert was born.