Freund DA, Hurley RE, Adamache KW, Mauskopf J. The performance of urban and public hospitals and NHCs (neighborhood health centers) under Medicaid capitation programs. Hosp Health Serv Adm. 1990 Jan 1;35(4):525-46.
Rothman KJ, Velez H, Glass RL, Mejia R, Espinal F. Dental caries and soil contents of trace metals in two Colombian villages. J Dent Res. 1972 Nov 1;51(6):1686.