Hetzinger, S., Halfar, J., Zack, T., Mecking, J. V., Kunz, B. E., Jacob, D. E., and Adey, Walter H. 2013. "Coralline algal Barium as indicator for 20th century northwestern North Atlantic surface ocean freshwater variability." Scientific Reports, 3, (1761). https://doi.org/10.1038/srep01761.