1. A bloom of Tympanicysta Balme (green algae of zygnematalean affinities) at the Permian–Triassic boundary;Afonin;Geodiversitas,2001
2. The Permian–Triassic boundary in Southern Alps (Italy);Assereto,1973
3. Palynology of Permian and Triassic strata in the Salt Range and Surghar Range, West Pakistan;Balme,1970
4. Palynology of Permian–Triassic boundary beds at Kap Stosch, East Greenland;Balme,1980
5. Stratigrafia, petrografia e sedimentologia delle facies carbonatiche al limite Permiano–Trias nelle Dolomiti Occidentali;Bosellini,1964