Classification of B�cklund transformations of second-order partial differential equations
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1993 ◽
Vol 89
(2)
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pp. 95-151
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1993 ◽
Vol 89
(1)
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pp. 1-61
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1994 ◽
pp. 117-143
2015 ◽
Vol 53
(1)
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pp. 405-420
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2015 ◽
Vol 284
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pp. 807-834
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1961 ◽
Vol 14
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pp. 171-186
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1992 ◽
Vol 44
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pp. 371-375
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