King, A. H. (1998). A review of the cyclostomiceratid nautiloids, including new taxa from the Lower Ordovician of Öland, Sweden. Palaeontology. 44: 335-347.
479026
King, A. H.
1998
A review of the cyclostomiceratid nautiloids, including new taxa from the Lower Ordovician of Öland, Sweden