Lock AD, Allen AR, Fleming AD, Goatman KA. The effect of watermarking on automated assessment of diabetic retinal images. IEEE T Inf Technol B. 2012 Jan 1.
López MV, Rivero E, Serra C, Campo M, Raurich M, Bonfill X. Health survey in health care professionals in Barcelona. Arch Prev Riesgos Laborales. 1998;1(2):55-62.