Investigation of the thermal diffusivity of thick film NTC layers obtained with the photoacoustic method O.A. Aleksic, P.M. Nikolic, D. Lukovic, S. Savic, D. Vasiljevic-Radovic, K. Radulovic, L. Lukic, A. Bojičic and D. Uroševic J. Phys. IV France, 125 (2005) 431-433 DOI: 10.1051/jp4:2005125101