@article{JEDP_1983____A6_0,
     author = {Liess, Otto and Rodino, Luigi},
     title = {A general class of {Gevrey-type} pseudo differential operators},
     journal = {Journ\'ees \'equations aux d\'eriv\'ees partielles},
     eid = {6},
     pages = {1--8},
     publisher = {Ecole polytechnique},
     year = {1983},
     zbl = {0516.35086},
     language = {en},
     url = {http://www.numdam.org/item/JEDP_1983____A6_0/}
}