Zero-bias anomalies in low-doped La1−xCaxMnO3 manganite single crystals B. Dolgin, M. Belogolovskii, V. Markovich and G. Jung EPL, 103 2 (2013) 27002 Published online: 13 August 2013 DOI: 10.1209/0295-5075/103/27002