Non-Uniqueness and Uniqueness in the Cauchy Problem at Simple Characteristic Points.
Mathematische Annalen, Tome 203 (1973), pp. 231-238.

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     author = {Jan Persson},
     title = {Non-Uniqueness and {Uniqueness} in the {Cauchy} {Problem} at {Simple} {Characteristic} {Points.}},
     journal = {Mathematische Annalen},
     pages = {231--238},
     publisher = {mathdoc},
     volume = {203},
     year = {1973},
     zbl = {0243.35082},
     url = {http://geodesic.mathdoc.fr/item/MAN_1973__203_162444/}
}
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Jan Persson. Non-Uniqueness and Uniqueness in the Cauchy Problem at Simple Characteristic Points.. Mathematische Annalen, Tome 203 (1973), pp. 231-238. http://geodesic.mathdoc.fr/item/MAN_1973__203_162444/