R. Giovanoli, P. Bürki, M. Giuffredi, and W. Stumm, “Layer Structured Manganese Oxide Hydroxides. IV: The Buserite Group; Structure Stabilization by Transition Elements”, Chimia, vol. 29, no. 12, p. 517, Dec. 1975, doi: 10.2533/chimia.1975.517.