Stammeier, J. A., Hippler, D., Nebel, O., Leis, A., Grengg, C., Mittermayr, F., Kasemann, S. A., Dietzel, M. (2019): Radiogenic Sr and Stable C and O Isotopes Across Precambrian-Cambrian Transition in Marine Carbonatic Phosphorites of Malyi Karatau (Kazakhstan)-Implications for Paleo-environmental Change. - Geochemistry Geophysics Geosystems (G3), 20, 1, 3-23.https://doi.org/10.1029/2018GC007767