1. Les microspores monolètes de Paleozoique;Alpern,1973
2. On some spore specimens from British Upper Carboniferous coals;Balme;Geological Magazine,1951
3. The stratigraphical significance of certain fossil spores in the central group of British Coalfields;Balme;Transactions of the Institution of Mining Engineers London,1952
4. Spore assemblage out of a Lower Carboniferous shale from Spitsbergen;Bharadwaj;The Palaeobotanist,1960
5. The occurrence of reworked miospores in a Westphalian C microflora from South Limburg (The Netherlands) and its bearing on paleogeography;Bless;Mededelingen Rijks geologische Dienst,1976