Doward LC, Meads DM, Fisk JD, McKenna SP, Eckert BJ. Derivation of a unidimensional scale from the fatigue impact scale. Mult Scler. 2006 Sep;12(Suppl 1):S1-S228.
Webster AJ, Saville C, Church BM, Gnanasakthy A, Moss R. Some effects of different rearing systems on health, cleanliness and injury in calves. Vet J. 1985 Sep;141(5):472-83.
Webster AJ, Saville C, Church BM, Gnanasakthy A, Moss R. The effect of different rearing systems on the development of calf behaviour. Vet J. 1985 May;141(3):249-64.