Ferruccio Colombini and Francesco Fanelli. A note on non-homogeneous hyperbolic operators with low regularity coeffcients. Rend. Istit. Mat. Univ. Trieste, 42(suppl.):1-25, 2010.
Raphal Danchin and Francesco Fanelli. The well-posedness issue for the density-dependent Euler equations in endpoint Besov spaces. J. Math. Pures Appl. (9), 96(3):253:278, 2011.
Francesco Fanelli. Conservation of geometric structures for non-homogeneous inviscid incompressible fluids. Comm. Partial Differential Equations (to appear), 2012.