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
Michels KB, Rothman KJ. Update on unethical use of placebos in randomised trials. Bioethics. 2003 Apr;17(2):188-204.