1. Lower and Middle Devonian spores of North and Central Vestspitsbergen;Allen K. C.;Palaeontology,1965
2. Spore assemblages and their stratigraphical implications in the Lower and Middle Devonian of North and Central Vestspitsbergen;Allen K. C.;Palaeontology,1967
3. A review of in situ late Silurian and Devonian spores
4. On spores (including germinating spores) of Rhynia major Kidston & Lang;Bhutta A. A.;Biologia,1973
5. On the spores (including germinating spores) of Horneophyton (Hornea) lignieri (Kidston & Lang) Barghoorn & Darrah (1938);Bhutta A. A.;Pak. J. Bot.,1973