1. The Permian Triassic boundary in the Southern Alps (Italy);Assereto,1973
2. Palynology of Permian and Triassic strata in the Salt Range and Surghar Range, West Pakistan;Balme,1970
3. Microflora of the Permian and Lower Triassic sediments of the Mecsek Mountain (South Hungary);Barabàs-Stuhl;Acta Geol. Acad. Sci. Hung.,1981
4. Palynofacies, palaeoenvironments, and petroleum;Batten;J. Micropalaeontol.,1982
5. Permian Triassic of the Tethys: carbon isotope studies;Baud;Geol. Rundsch.,1989