%0 Journal Article %A Ch. G. Massouros %T Constructions of Hyperfields %J Mathematica balkanica %D 1991 %P 250 %V 5 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/item/MABA_1991_5_3_a7/ %F MABA_1991_5_3_a7