Geyer, G.; Valent, M.; Meier, S. (2019). Helcionelloids, stenothecoids and hyoliths from the Tannenknock Formation (traditional lower middle Stage 4/Wuliuan boundary interval) of the Franconian Forest, Germany. PalZ. 93(2): 207-253 [2018].
Helcionelloids, stenothecoids and hyoliths from the Tannenknock Formation (traditional lower middle Stage 4/Wuliuan boundary interval) of the Franconian Forest, Germany