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Holtslag, H., Jongh, J, de, Sutton, S., Nijssen, D., Haanen, R., y Veldman, R., «Smart hygiene solutions : affordable options for household level». Smart Centre Group, Wageningen, the Netherlands, p. 20 p. : ill., photogr., 2020.
Foppen, A.H., Holtslag, H., y Chekol, C.G., «The utility approach : extended distribution for household water filters in Ethiopia», presented at the 03/2019, The Hague, The Netherlands, 2019, p. 8 p.: 1 fig.
Holtslag, H. y Mgina, W., «Smart techs : new options to improve WASH in schools», in Faith in water, Salisbury, UK, July 5th – 7th 2009 : conference papers , 2009, pp. P. 111-115.