Gravili, C., Pavesi, L., Boero, F., & Tendal, O. S. (2018).

A review of Paul Lassenius Kramp’s hydrozoan types (taxonomic status, location and condition of the material) and a biography of the Danish zoologist

. Zootaxa, 4407(1), 65–85. https://doi.org/10.11646/zootaxa.4407.1.4