• Etxebarria, N., Zuloaga, O., Olivares, M., Bartolomé, L., Navarro, P.  Retention-time locked methods in gas chromatography Journal of Chromatography A,  2009;  1216(10),  1624 - 1629
• Maguregui, M., Sarmiento, A., Escribano, R., Martinez-Arkarazo, I., Castro, K., Madariaga, J.M.  Raman spectroscopy after accelerated ageing tests to assess the origin of some decayed products found in real historical bricks affected by urban polluted atmospheres Analytical and Bioanalytical Chemistry,  2009;  395,  2119 - 2129
• Moros, J., Fdez-Ortiz de Vallejuelo, S., Gredilla, A., de Diego, A., Madariaga, J.M., Garrigues, S., de la Guardia, M.  Use of Reflectance Infrared Spectroscopy for Monitoring the Metal Content of the Estuarine Sediments of the Nerbioi-Ibaizabal River (Metropolitan Bilbao, Bay of Biscay, Basque Country) Environmental Science & Technology,  2009;  43(24),  9314 - 9320
• Navarro, P., Etxebarria, N., Arana, G.  Development of a focused ultrasonic-assisted extraction of polycyclic aromatic hydrocarbons in marine sediment and mussel samples Analytica Chimica Acta,  2009;  648(2),  178 - 182
• Raposo, J.C., Bartolomé, L., Cortazar, E., Arana, G., Zabaljauregui, M., de Diego, A., Zuloaga, O., Madariaga, J.M., Etxebarria, N.  Trace Metals in Oysters, Crassotrea sps., from UNESCO Protected Natural Reserve of Urdaibai: Space-Time Observations and Source Identification Bulletin of Environmental Contamination and Toxicology,  2009;  83,  223 - 229