@article{RSM_2002__60_2_116632,
     author = {Calvo, D.},
     title = {Generalized {Gevrey} classes and multi-quasi-hyperbolic operators.},
     journal = {Rendiconti del seminario matematico},
     pages = {73--99},
     publisher = {mathdoc},
     volume = {60},
     number = {2},
     year = {2002},
     zbl = {1177.35050},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/RSM_2002__60_2_116632/}
}