Partially elliptic pseudodifferential operators and the WF x of distributions
Rendiconti del Seminario Matematico della Università di Padova, Tome 56 (1976), pp. 245-255. 
@article{RSMUP_1976__56__245_0,
     author = {Menegus, Annalisa and Olivi, Giuseppe},
     title = {Partially elliptic pseudodifferential operators and the $WF_x$ of distributions},
     journal = {Rendiconti del Seminario Matematico della Universit\`a di Padova},
     pages = {245--255},
     publisher = {Seminario Matematico of the University of Padua},
     volume = {56},
     year = {1976},
     zbl = {0375.35054},
     mrnumber = {487124},
     language = {en},
     url = {http://www.numdam.org/item/RSMUP_1976__56__245_0/}
}
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Menegus, Annalisa; Olivi, Giuseppe. Partially elliptic pseudodifferential operators and the $WF_x$ of distributions. Rendiconti del Seminario Matematico della Università di Padova, Tome 56 (1976), pp. 245-255. http://www.numdam.org/item/RSMUP_1976__56__245_0/

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