@article{Echinoidea:SourceID:3158, author = {Mortensen, T.}, journal = {Wissenschaftliche Ergebnisse der Schwedischen Südpolar Expedition 6/4}, pages = {1-114}, title = {The Echinoidea of the Swedish South Polar Expedition}, url = {https://www.biodiversitylibrary.org/page/6227595}, year = {1910} }