$a Local jet bundle formulation of bäcklund transformations : with applications to non-linear evolution equations / F. A. E. Pirani, D. C. Robinson, W. F. Shadwick. - Dordrecht ; London, 1979.
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$a LCC online
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$a LCN'1996
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$a The ABC of relativity / Bertrand Russell. - London, 1969. $b Red.