The non-invariance of hyperbolicity in partial differential equations.
Johnson, H. H.
Pacific J. Math., Tome 23 (1967) no. 3, p. 419-430 / Harvested from Project Euclid
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Publié le : 1967-05-14
Classification:  35.10,  57.00 
@article{1102992096,
     author = {Johnson, H. H.},
     title = {The non-invariance of hyperbolicity in partial differential equations.},
     journal = {Pacific J. Math.},
     volume = {23},
     number = {3},
     year = {1967},
     pages = { 419-430},
     language = {en},
     url = {http://dml.mathdoc.fr/item/1102992096}
}

Johnson, H. H. The non-invariance of hyperbolicity in partial differential equations.. Pacific J. Math., Tome 23 (1967) no. 3, pp.  419-430. http://gdmltest.u-ga.fr/item/1102992096/