Piero Frediani, Carlo Manganelli Del Fa', Ugo Matteoli, Piero Tiano, Use of Perfluoropolyethers as Water Repellents: Study of Their Behaviour on Pietra Serena, a Florentine Building Stone, Studies in Conservation, Vol. 27, No. 1 (Feb., 1982), pp. 31-37
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Frediani et al. (1982) studied this question.
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