%0 Journal Article %A Karel, M. %T Eisenstein series and fields of definition %J Compositio Mathematica %D 1978 %P 121-169 %V 37 %N 2 %I Sijthoff et Noordhoff International Publishers %U http://www.numdam.org/item/CM_1978__37_2_121_0/ %G en %F CM_1978__37_2_121_0