Citation: Delaplane, R. G.; Ibers, J. A.; Ferraro, J. R.; Rush, J. J. (1969). Diffraction and spectroscopic studies of the cobaltic acid system HCoO2 - DCoO2 Note: X-ray study Note: polytype known as Heterogenite-3R. Journal of Chemical Physics, 50, pp. 1920-1927.