1. Palynology of the Number Five Seam in the Witbank/Highveld Coalfields;Aitken,1993
2. Permian palynomorphs from the number 5 seam, Ecca group, Witbank/Highveld Coalfields, South Africa;Aitken;Palaeontologia africana,1994
3. A Palynological and Palaeoenvironmental Analysis of Permian and Early Triassic Sediments of the Ecca and the Beaufort groups, Northern Karoo Basin, South Africa;Aitken,1998
4. The Biostratigraphy of the Permian and Triassic, Part 3;Anderson;Memoirs of the Botanical Survey of South Africa,1977
5. Permian palynostratigraphy of the Collie Basin, Western Australia;Backhouse;Review of Palaeobotany and Palynology,1991