Optimization of dying variables in PET: Using thermal diffusivity response as a probe in a multivariable algorithm L. Olenka, A.F. Rubira, E.C. Muniz, A.N. Medina, M.L. Baesso et A.C. Bento J. Phys. IV France, 125 (2005) 573-576 DOI: 10.1051/jp4:2005125132