@article{EJDE_2006__2006__a29,
     author = {Pulkin,  Igor S.},
     title = {Gevrey problem for parabolic equations with changing time direction},
     journal = {Electronic journal of differential equations},
     year = {2006},
     volume = {2006},
     zbl = {1112.35035},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/EJDE_2006__2006__a29/}
}