Mercury and selenium in marine mammals and birds von Koeman, J.H., van de Ven, W.S.M., de Goeij, J.J.M., Tjioe, P.S., van Haaften, J.L.

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A search for losses of chromium and other trace elements during lyophilization of human liver tissue von de Goeij, J.J.M., Volkers, K.J., Tjioe, P.S.

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preliminary survey of the possible contamination of Lake Nakuru in Kenya with some metals and chlorinated hydrocarbon pesticides von Koeman, J.H, Pennings, J.H, De Goeij, J.J.M, Tjioe, P.S, Olindo, P.M, Hopcraft, J

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Automated chemical separations in routine activation analysis von Tjoie, P. S., Goeij, J. J. M., Houtman, J. P. W.

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