Reference
Leona Koptikova, Jindrich Hladil, Ladislav Slavik, Jaroslav Frana (2009): Lochkovian-Pragian boundary in the Prague Synform: lithological, mineralogical, geophysical and geochemical aspects as results of sea-level fall – Berichte der Geologischen Bundesanstalt – 79: 28 - 31.