STUDY OF "PURE" KTaO3 AND KTN SINGLE CRYSTALS BY THERMAL CONDUCTIVITY MEASUREMENTS DOWN TO 50 mK B. Salce, A.M. De Goër and L.A. Boatner J. Phys. Colloques, 42 C6 (1981) C6-424-C6-426 DOI: 10.1051/jphyscol:19816124