1. Propagation of singularities for hyperbolic pseudodifferential operators with non-smooth coefficients;Beals;Comm. Pure Appl. Math.,1982
2. Calcul symbolique et propagation des sigularités pour les équations aux dérivées partelles non-linéaries;Bony;Ann. Sci. École Norm. Sup. (4),1981
3. Exponential stability in thermoelasticity with microtemperatures;Casas;Int. J. Engry. Sci.,2005
4. S. Chen Analysis of Singularities for Partial Differential Equations (Shanghai Sci. Tech. Publishers, 1998) (in Chinese).
5. S. Chen Q. J. Qiu C. Z. Li Introduction to Paradifferential Operators (Sci. Publishers, 1990) (in Chinese).