. . . . . . . . . "Mineralogy and instrumental neutron activation analysis of seven National Bureau of Standards and three Instituto de Pesquisas Tecnológicas clay reference samples" . . . . . . "Mineralogy and Instrumental Neutron Activation Analysis of Seven National Bureau of Standards and Three Instituto de Pesquisas Tecnologicas Clay Reference Samples" . "Mineralogy and instrumental neutron activation analysis of seven National Bureau of Standards and three Instituto de Pesquisas Tecnologicas clay reference samples"@en . . . . . "Neutronenaktivierungsanalyse." . . . . "Ton (Geologie)" . .