@article{EJDE_2010__2010__a252,
     author = {Kawagishi,  Masaki},
     title = {A {Holmgren} type theorem for partial differential equations whose coefficients are {Gevrey} functions},
     journal = {Electronic journal of differential equations},
     year = {2010},
     volume = {2010},
     zbl = {1191.35012},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/EJDE_2010__2010__a252/}
}