Alsina-Pages RM, Freixes M, Orga F, Foraster M, Labairu-Trenchs A. Perceptual evaluation of the citizen's acoustic environment from classic noise monitoring. Cities & health. 2020 Mar 11;5(1-2):145-9. doi: 10.1080/23748834.2020.1737346
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.