%0 Journal Article %A Jens Schwaiger %A Wolfgang Förg-Rob %T On the stabiltiy of a system of functional equations characterizing generalize hyperbolic and trigonometric functions. %J Aequationes mathematicae %D 1993 %P 285-296 %V 45 %N 2-3 %I mathdoc %U http://geodesic.mathdoc.fr/item/AM2_1993__45_2-3_137529/ %F AM2_1993__45_2-3_137529