1. Hyperbolic systems with non-diagonalisable principal part and variable multiplicities, I: well-posedness;Garetto;Math. Ann.,2018
2. Cauchy problem for some 2×2 hyperbolic systems of pseudo-differential equations with nondiagonalisable principal part;Gramchev,2013
3. Fourier integral operators. I;Hörmander;Acta Math.,1971
4. The Analysis of Linear Partial Differential Operators I;Hörmander,1990
5. Propagation of singularities for a hyperbolic system with double characteristics;Ichinose;Osaka J. Math.,1982