@article{RSMUP_1988__80__203_0,
     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},
     publisher = {Seminario Matematico of the University of Padua},
     volume = {80},
     year = {1988},
     mrnumber = {988122},
     zbl = {0714.35042},
     language = {en},
     url = {http://www.numdam.org/item/RSMUP_1988__80__203_0/}
}