G. D. Arthur, A. O. Aremu, M. Moyo, W. A. Stirk, and J. van Staden, “Growth-promoting effects of a seaweed concentrate at various pH and water hardness conditions”, S. Afr. J. Sci., vol. 109, no. 11/12, p. 6, Nov. 2013, doi: 10.1590/sajs.2013/20120013.