David Hilbert, “Mathematical Problems”. 2017年10月28日閲覧。 Bulletin of the American Mathematical Society, vol. 8, no. 10 (1902), pp. 437–479. Earlier publications (in the original German) appeared in Göttinger Nachrichten, 1900, pp. 253–297, and Archiv der Mathematik und Physik, 3rd series, vol. 1 (1901), pp. 44–63, 213–237.