Richman 1997 Richman, Fred (1997), "Flat dimension, constructivity, and the Hilbert syzygy theorem", New Zealand Journal of Mathematics, 26 (2): 263–273, ISSN1171-6096, MR1601663
Richman 1997 Richman, Fred (1997), "Flat dimension, constructivity, and the Hilbert syzygy theorem", New Zealand Journal of Mathematics, 26 (2): 263–273, ISSN1171-6096, MR1601663