%0 Journal Article %A D. Laugwitz %T Hidden lemmas in the early history of infinite series. %J Aequationes mathematicae %D 1987 %P 264-276 %V 34 %I mathdoc %U http://geodesic.mathdoc.fr/item/AM2_1987__34_137244/ %F AM2_1987__34_137244