Bulk and interface contributions to the PTCR thermistor effect in 'BA IND. 1-X''ER IND. X''TI''O IND. 3' electroceramic materials - Bonacin, R.; Bernardi, Maria Inês Basso; M'Peko, Jean-Claude (International Symposium on Advanced Materials and Nanostructures - ISAMN, 2012)