A simple construction of a parametrix for a regular hyperbolic operator
Rendiconti del Seminario Matematico della Università di Padova, Tome 80 (1988), pp. 203-213 
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     author = {Segala, Fausto},
     title = {A simple construction of a parametrix for a regular hyperbolic operator},
     journal = {Rendiconti del Seminario Matematico della Universit\`a di Padova},
     pages = {203--213},
     year = {1988},
     publisher = {Seminario Matematico of the University of Padua},
     volume = {80},
     mrnumber = {988122},
     zbl = {0714.35042},
     language = {en},
     url = {https://www.numdam.org/item/RSMUP_1988__80__203_0/}
}
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Segala, Fausto. A simple construction of a parametrix for a regular hyperbolic operator. Rendiconti del Seminario Matematico della Università di Padova, Tome 80 (1988), pp. 203-213. https://www.numdam.org/item/RSMUP_1988__80__203_0/

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