Topology of desiccation crack patterns in clay and invariance of crack interface area with thickness Tajkera Khatun, Tapati Dutta and Sujata Tarafdar Eur. Phys. J. E, 38 8 (2015) 83 Published online: 10 August 2015 DOI: 10.1140/epje/i2015-15083-6