@article{RSMUP_1990__84__255_0,
     author = {Delladio, Silvano},
     title = {Some remarks on time-dependent evolution systems in the hyperbolic case},
     journal = {Rendiconti del Seminario Matematico della Universit\`a di Padova},
     pages = {255--261},
     publisher = {Seminario Matematico of the University of Padua},
     volume = {84},
     year = {1990},
     mrnumber = {1101298},
     zbl = {0756.35046},
     language = {en},
     url = {http://archive.numdam.org/item/RSMUP_1990__84__255_0/}
}