F Azeem Majeed, Derek G Cook, Jan Poloniecki, Jo Griffiths, Caroline Stones
Majeed F A, Cook D G, Poloniecki J, Griffiths J, Stones C.
Sociodemographic variables for general practices: use of census data
BMJ 1995; 310 :1373
doi:10.1136/bmj.310.6991.1373