On Maximal First Order Partial Differential Operators
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1980 ◽
Vol 38
(1)
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pp. 118-138
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2014 ◽
Vol 22
(1)
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pp. 85-103
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1987 ◽
Vol 131
(1)
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pp. 33-47
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2017 ◽
Vol 63
(7-8)
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pp. 945-960
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1972 ◽
Vol 165
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pp. 75-75