Solvability near the characteristic set for a class of first-order linear partial differential operators
2017 ◽
Vol 291
(8-9)
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pp. 1240-1268
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1983 ◽
Vol 8
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pp. 643-665
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2007 ◽
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pp. 225-237
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2008 ◽
pp. 199-212
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2009 ◽
Vol 247
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1980 ◽
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pp. 118-138
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