%0 Journal Article %A Poorten, Alfred van der %A Williams, Kenneth S. %T Values of the Dedekind Eta Function at Quadratic Irrationalities %J Canadian journal of mathematics %D 1999 %P 176-224 %V 51 %N 1 %U http://geodesic.mathdoc.fr/articles/10.4153/CJM-1999-011-1/ %R 10.4153/CJM-1999-011-1 %F 10_4153_CJM_1999_011_1