https://royalsocietypublishing.org/doi/pdf/10.1098/rstb.1991.0012 (Publisher version)
Blake, A., & Bülthoff, H. (1991). Shape from Specularities: Computation and Psychophysics. Philosophical Transactions of the Royal Society of London Series B: Biological Sciences, 331(1260), 237-252. doi:10.1098/rstb.1991.0012.