• Amigo, J.M., Arana, G., Etxebarria, N., Fernández, L.Á.  Emerging needs for sustained production of laboratory reference materials TrAC Trends in Analytical Chemistry,  2004;  23(1),  80 - 85
• Antolín, R., Posada, T., Borge, G., Raposo, J.C., Seara, I., Etxebarria, N.  Inductively coupled plasma compared with direct current arc spectrometry for analysis of minor elements in aluminium baths Journal of AOAC International,  2004;  87(5),  1218 - 1223
• Castro, K. , Pérez-Alonso, M., Rodríguez-Laso, M.D., Madariaga, J.M.  Estudio mediante Espectroscopia Raman de los Pigmentos presentes en Papeles Pintados del Siglo XIX Avances en Arqueometría 2003 (arg.: M.J. Feliu Ortega et al.),  2004;  10 - 16 -  84-96274-65-3
• Castro, K. , Pérez, M., Cepedal, E., Rodríguez-Laso, M.D., Madariaga, J.M.  Analysis of two different industrial coated papers: a new methodological approach Paper as a medium of cultural heritage. Archeology and Conservation (arg.: R. Graziaplena and M. Livesey), Instituto Centrale per la Patologia del libro, Italia, Erroma,  2004;  13 - 21 -  88-8298-02-9
• Castro, K., Pérez-Alonso, M., Rodríguez-Laso, M.D., Madariaga, J.M.  Pigment analysis of a wallpaper from the early 19th century: Les Monuments de Paris Journal of Raman Spectroscopy,  2004;  35(8-9),  704 - 709
• Castro, K., Pérez-Alonso, M., Rodríguez-Laso, M.D., Madariaga, J.M.  Raman fibre optic approach to artwork dating Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy,  2004;  60(12),  2919 - 2924
• Castro, K., Vandenabeele, P., Rodríguez-Laso, M.D., Moens, L., Madariaga, J.M.  Micro-Raman analysis of coloured lithographs Analytical and Bioanalytical Chemistry,  2004;  379(4),  674 - 683
• Landajo, A., Arana, G., De Diego, A., Etxebarria, N., Zuloaga, O., Amoroux, D.  Analysis of heavy metal distribution in superficial estuarine sediments (estuary of Bilbao, Basque Country) by open-focused microwave-assisted extraction and ICP-OES Chemosphere,  2004;  56(11),  1033 - 1041
• Larreta, J., Martínez, I., Sanz, J., Raposo, J.C., Tueros, I., De Diego, A., Fernández, L.A., Madariaga, J.M.  Mercury speciation by Hydride Generation Atomic Absorption Spectrometry after Ion Exchange Separation in a FIA System (FIA-IE-HG-ASS) RMZ-Materials and Geoenvironment, Institute for Mining, Geotechnology and Environment, Ljubiljana, Slovenia,  2004;  51,  1963 - 1967 -  1408-7073
• Pérez-Alonso, M., Castro, K., Álvarez, M., Madariaga, J.M.  Scientific analysis versus restorer's expertise for diagnosis prior to a restoration process: the case of Santa Maria Church (Hermo, Asturias, North of Spain) Analytica Chimica Acta,  2004;  524(1-2),  379 - 389