Wiernik G, Bleehen N M, Brindle J, Meredith-Brown D, Churchill-Davidson I F, Davidson J C, Finney R, Fowler J F, Hadden R C, Halnan K E, Haybittle J L, Lansley I F, Howard N, O'Connell D, Phillips D L, Sambrock D K, Shanks W, Sicher K, Skeggs D, Stewart M A, Tudway R C
Br J Radiol. 1972 Oct;45(538):754-6. doi: 10.1259/0007-1285-45-538-754.