Reducing real almost-linear second-order partial differential operators in two independent variables to a canonical form
1983 ◽
Vol 8
(6)
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pp. 643-665
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1970 ◽
Vol 69
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pp. 77-84
1912 ◽
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pp. 406-422
2006 ◽
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pp. 579-584
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Keyword(s):
2013 ◽
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pp. 379-406
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2020 ◽
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pp. 75-122
2010 ◽
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pp. 363-375
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1993 ◽
Vol 89
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pp. 1-61
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1978 ◽
Vol 79
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pp. 193-226
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