A result on the well posedness of the Cauchy problem for a class of hyperbolic operators with double characteristics
Rendiconti del Seminario Matematico della Università di Padova, Tome 93 (1995), pp. 87-102. 
@article{RSMUP_1995__93__87_0,
     author = {Petrini, Milena},
     title = {A result on the well posedness of the {Cauchy} problem for a class of hyperbolic operators with double characteristics},
     journal = {Rendiconti del Seminario Matematico della Universit\`a di Padova},
     pages = {87--102},
     publisher = {Seminario Matematico of the University of Padua},
     volume = {93},
     year = {1995},
     mrnumber = {1354351},
     zbl = {0836.47037},
     language = {en},
     url = {http://www.numdam.org/item/RSMUP_1995__93__87_0/}
}
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Petrini, Milena. A result on the well posedness of the Cauchy problem for a class of hyperbolic operators with double characteristics. Rendiconti del Seminario Matematico della Università di Padova, Tome 93 (1995), pp. 87-102. http://www.numdam.org/item/RSMUP_1995__93__87_0/

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