A routine chromium determination in biological materials : application to various reference materials and standard reference materials / P. S. Tjioe, J. J. M. de Goeij, K. J. VolkersDetermination of trace elements in dried sea-plant homogenate (SP-M-1) and in dried copepod homogenate (MA-A-1) by means of neutron activation analysis / P.S. Tjioe, J.J.M. de Goeij, M. de Bruin
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A search for losses of chromium and other trace elements during lyophilization of human liver tissue / J. J. M. de Goeij, K. J. Volkers and P. S. TjioeKwiklekken van mechanische amalgaammengers / J. P. W. Houtman, P. S. TjioeDetermination of trace elements in BCR single cell protein via destructive neutron activation analyses / P.S. Tjioe ... [et al.]