%0 Journal Article %A S.A. Katre %A A.R. Rajwade %T Resolution of the sign ambiguity in the determination of the cyclotomic numbers of order 4 and the corresponding Jacobsthal sum. %J Mathematica Scandinavica %D 1987 %P 52-62 %V 60 %I mathdoc %U http://geodesic.mathdoc.fr/item/MS2_1987__60_167008/ %F MS2_1987__60_167008