1. Indications for cataract surgery;Wong, W.W.;Arch Ophthalmol,1978
2. Standardising diagnostic procedures;Khan, H.A.; Liebowitz, H.; Ganley, J.P.;Am J Ophthalmol,1975
3. Dissertation submitted to the University of London for the degree of MSc Social Medicine;Sanderson, H.F.,1978
4. Statistical Methods in Medical Research;Armitage, P.,1971
5. Observer errors in taking medical histories;Cochrane, A.L.; Chapman, P.J.; Oldham, P.D.;Lancet,1951