@misc{wallmann_study_of_1990, 
author={Wallmann, K., Petersen, W., Li, P.},
title={Study of lead fulvic acid interactions by voltammetric methods},
year={1990},
howpublished = {book part},
note = {Wallmann, K.; Petersen, W.; Li, P.: Study of lead fulvic acid interactions by voltammetric methods. In: Broekaert, J.; Guecer, S.; Adams, F. (Ed.): Metal speciation in the environment - NATO ASI Series. Berlin: Springer. 1990. 71-77.}}