@article{10_21136_CMJ_1979_101644,
     author = {Bolley, Pierre and Camus, Jacques},
     title = {Powers and {Gevrey's} regularity for a system of differential operators},
     journal = {Czechoslovak Mathematical Journal},
     pages = {649--661},
     publisher = {mathdoc},
     volume = {29},
     number = {4},
     year = {1979},
     doi = {10.21136/CMJ.1979.101644},
     mrnumber = {548225},
     zbl = {0423.35024},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.21136/CMJ.1979.101644/}
}