  Motivated by AdS/CFT, the extension is made to spin-half of a scalar
calculation of the conformal anomalies and functional determinants of GJMS
operators. The formal aspects are heuristic but sufficient. A Barnes zeta
function representation again proves effective. The determinants are calculated
for the two factorisations of the gamma-function (intertwiner) form of the GJMS
operator, and shown to be equal, even including the multiplicative anomaly. A
comment is made on the general eigenvalue problem and a few numerical results
are presented. An alternative approach is detailed for odd dimensions and it is
shown that the scalar determinants are expressed in terms of the spinor ones,
and vice versa. An explicit, general form is given.
