1. Studies on Recent Cyclostomatous Bryozoa;Borg;Zool. Bidr. Uppsala,1926
2. Cyclostomatous Bryozoa from the Upper Cretaceous and Danian in Scandinavia;Brood;Acta Univ. Stockh., Stockh. Contrib. Geol.,1972
3. The Polyzoa of the Siboga Expedition. I. Entoprocta, Ctenostomata and Cyclostomata;Harmer;Siboga Exp.,1915