Ćalić-Ljubojević, Jelena, Geographic Institute “Jovan Cvijić“ of the Serbian Academy of Sciences and Arts, Djure Jakšića 9, YU-11000 Belgrade

• Acta Carsologica Vol. 29 No. 2 (2000) - Original papers
  Natural Bridges on the Vratna River (Eastern Serbia) as the Last Remnants of a Former Cave
  Abstract  Untitled