1. Pneumatic grab system;Preussag Data Sheet 165–311 Hannover,1983
2. Manganknollen-Analysensystem MANKA;Borcherding;KFK,1977
3. Inductively coupled plasma-atomic emission spectroscopy: its present position in analytical chemistry;Boumans;ICP Inf. Newsl.,1979
4. Determination of copper in saline waters by atomic absorption spectrophotometry combined with APDC-MIBK extraction;Brooks;Talanta,1967
5. Underwater minerals;Cronan,1980