Citation: P. Tchoumatchenco et A. Uchman, The oldest deep-sea Ophiomorpha and Scolicia and associated trace fossils from the Upper Jurassic-Lower Cretaceous deep-water turbidite deposits of SW Bulgaria, PALAEOGEO P, 169(1-2), 2001, pp. 85-99
Citation: P. Tchoumatchenco et A. Uchman, Lower and Middle Jurassic flysch trace fossils from the eastern Stara Planina Mountains, Bulgaria: A contribution to the evolution of mesozoic ichnodiversity, N J GEO P-A, 213(2), 1999, pp. 169-199