@incollection{JEDP_1989____A15_0,
     author = {Cattabriga, L. and Zanghirati, L.},
     title = {Global analytic and {Gevrey} surjectivity of the {Mizohata} operator $D_2+ix_2^{2k}D_1$},
     booktitle = {},
     series = {Journ\'ees \'equations aux d\'eriv\'ees partielles},
     eid = {15},
     pages = {1--4},
     publisher = {Ecole polytechnique},
     year = {1989},
     zbl = {0697.35028},
     language = {en},
     url = {http://www.numdam.org/item/JEDP_1989____A15_0/}
}