Vol. 47, p. 401, change the affiliation of author P. Bylina to: Faculty of Geodesy and Cartography, Warsaw University of Technology, Pl. Politechniki 1, 00-661 Warsaw, Poland, and Institute of Ceramics and Building Materials, ul. Postępu 9, 02-676 Warsaw, Poland

Vol. 48, p. 595, amend the address of author F.R. Valenzuela Diaz to: Polytechnic School, University of São Paulo, 05508-900, São Paulo-SP, Brazil

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