Houalla, M., & Delmon, B. (1981). Joint Use of Xps and Diffuse Reflectance Spectroscopy for the Study of Cobalt Oxide Supported On Boron Modified Alumina. Applied Catalysis A: General, 1(5), 285-289. https://doi.org/10.1016/0166-9834(81)80034-6 (Original work published 1981)