1. Index of generic names of fossil plants, 1820–1965;Andrews;U.S. Geol. Surv. Bull.,1970
2. The Permian and Triassic Systems and Their Mutual Boundary;Assereto,1973
3. Note illustrative della carta geologica dell'area di Recoaro alla scale 1:20,000;Barbieri;Mem. Ist. Geol. Mineral. Univ. Padova,1980
4. The organization in pollengrains of some early conifers;Bharadwaj;Palaeobotanist,1964
5. Einige neue Sporengattungen der Saarkarbons;Bhardwaj;Neues Jarhb. Geol. Paläontol. Monatsh.,1954