Phonons in time-dependent hartree approximation with application to order-disorder ferroelectricsP.B. MillerP.C. Kwok1968Physical Review
Microscopic free energy and order parameters of antiferroelectricsP.B. MillerP.C. Kwok1967Solid State Communications
Theory of ultrasonic attenuation and second sound in insulatorsP.C. KwokP.C. Martinet al.1965Solid State Communications