@misc{emeis_black_shales_2017, 
author={Emeis, K.},
title={Black Shales and Sapropels},
year={2017},
howpublished = {book part},
doi = {https://doi.org/10.1007/978-3-319-39193-9_146-1},
note = {Online available at: \url{https://doi.org/10.1007/978-3-319-39193-9_146-1} (DOI). Emeis, K.: Black Shales and Sapropels. In: White, W. (Ed.): Encyclopedia of Geochemistry. Cham: Springer. 2017. DOI: 10.1007/978-3-319-39193-9_146-1}}