“…An interesting situation is the index 2 case, i.e., that in which the subgroup 1p2, generated by p, has index 2 in (9/m9)*. In [9], this case was studied under the assumption that p"2 and m is a product of two distinct primes. In this index 2 case the Gauss sums have been calculated if m"l in [1], and if m"lP in [7], where l is a prime such that l'3, l,3 (mod 4).…”