Veres, Zsolt, and Andrea Varga. 2020. “Carbonate Concretions in the Lower Miocene Pétervására Sandstone Formation (Pétervására Hills, Lelesz Valley): Genetic Considerations Based on Morphological and Petrographic Investigations ”. Földtani Közlöny 150 (3), 429. https://doi.org/10.23928/foldt.kozl.2020.150.3.429.