Comparison of the Burdizzo and rubber ring methods for castrating and tail docking lambs.
Kent JE, Molony V, Robertson IS, Vet Rec, 1995 Feb 25 - link

Changes in plasma cortisol concentration in lambs of three ages after three methods of castration and tail docking.
Kent JE, Molony V, Robertson IS, Res Vet Sci, 1993 Sep - link

Behavioural responses of lambs of three ages in the first three hours after three methods of castration and tail docking.
Molony V, Kent JE, Robertson IS, Res Vet Sci, 1993 Sep - link