Brock, R., Goudie, R., Peters, C., Thaxter, R., Gouliouris, T., Illingworth, C., Morris, A., Beggs, C., Butler, M. & Keevil, V. 2024, 'Efficacy of Air Cleaning Units for preventing SARS-CoV-2 and other hospital-acquired infections on medicine for older people wards: a quasi-experimental controlled before-and- after study', Journal of Hospital Infection. http://dx.doi.org/10.1016/j.jhin.2024.09.017