C. Koch

F. Früngel, C. Koch; Practical experience with the Variosens equipment in measuring chlorophyll concentrations and fluorescent tracer substances, like rhodamine, fluorescein, and some new substances, IEEE J. Oceanic Eng., vol. 1, pp. 21 - 32, September 1976.

F. Früngel, C. Koch; Fluorometric in situ measurements of water currents and mingling of waters in cases of heavy turbidity as in coastal shoal areas, IEEE J. Oceanic Eng., vol. 1, pp. 42 - 43, September 1976.

F. Fruengel, C. Koch; Practical experience with the 'Variosens' equipment in measuring chlorophyll concentrations and fluorescent tracer substances, like rhodamine, fluorescein and some new substances, OCEANS'74 --- IEEE International Conference on Engineering in the Ocean Environment, pp. 241 - 247, August 1974.