Gremmen N., Huiskes A., Bergstrom D., Lee J., Hughes K., Imura S., Tsujimoto M., Kiefer K., Lebouvier M., Watts D., Frenot Y., Chown S., Ware C., Stennhuisen F., VanCauwenberghe M. & Convey P. (2009). Aliens in Antarctica. Quantifying plant- and animal propagules inadvertently carried into the Antarctic.