[1]
Katre, S.A. and Rajwade, A.R. 1987. Resolution of the sign ambiguity in the determination of the cyclotomic numbers of order 4 and the corresponding Jacobsthal sum. MATHEMATICA SCANDINAVICA. 60, (Dec. 1987), 52–62. DOI:https://doi.org/10.7146/math.scand.a-12171.