%0 Journal Article %A Ayşe Alaca %T Representations by quaternary quadratic forms whose coefficients are 1, 3 and 9 %J Acta Arithmetica %D 2009 %P 151-166 %V 136 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/aa136-2-4/ %R 10.4064/aa136-2-4 %G en %F 10_4064_aa136_2_4